10-Q

Third

Quarter

2013

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF

THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 28, 2013

Commission file number 1-4119

NUCOR CORPORATION

(Exact name of registrant as specified in its charter)

Delaware	13-1860817
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1915 Rexford Road, Charlotte, North Carolina	28211
(Address of principal executive offices)	(Zip Code)

(704) 366-7000

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).     Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).     Yes  ¨    No  x

318,211,045 shares of common stock were outstanding at September 28, 2013.

Nucor Corporation

Form 10-Q

September 28, 2013

INDEX

			Page
Part I	Financial Information
	Item 1	Financial Statements (Unaudited)
		Condensed Consolidated Statements of Earnings - Three Months (13 Weeks) and Nine Months (39 Weeks) Ended September 28, 2013 and September 29, 2012		3
		Condensed Consolidated Statements of Comprehensive Income - Three Months (13 Weeks) and Nine Months (39 Weeks) Ended September 28, 2013 and September 29, 2012		4
		Condensed Consolidated Balance Sheets - September 28, 2013 and December 31, 2012		5
		Condensed Consolidated Statements of Cash Flows - Nine Months (39 Weeks) Ended September  28, 2013 and September 29, 2012		6
		Notes to Condensed Consolidated Financial Statements		7
	Item 2	Management’s Discussion and Analysis of Financial Condition and Results of Operations		21
	Item 3	Quantitative and Qualitative Disclosures About Market Risk		30
	Item 4	Controls and Procedures		31
Part II	Other Information
	Item 1	Legal Proceedings		32
	Item 1A	Risk Factors		32
	Item 6	Exhibits		32
Signatures				33
List of Exhibits to Form 10-Q				34

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PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

Nucor Corporation Condensed Consolidated Statements of Earnings (Unaudited)

(In thousands, except per share amounts)

	Three Months (13 Weeks) Ended					Nine Months (39 Weeks) Ended
	Sept. 28, 2013			Sept. 29, 2012		Sept. 28, 2013			Sept. 29, 2012
Net sales	$	4,940,936		$	4,801,206	$	14,157,296		$	14,977,999
Costs, expenses and other:
Cost of products sold		4,532,393			4,452,473		13,132,412			13,848,809
Marketing, administrative and other expenses		125,126			114,392		364,501			334,039
Equity in (earnings) losses of unconsolidated affiliates		(2,252	)		2,261		(2,665	)		9,093
Impairment of non-current assets		—			—		—			30,000
Interest expense, net		37,467			40,305		109,186			123,028
		4,692,734			4,609,431		13,603,434			14,344,969
Earnings before income taxes and noncontrolling interests		248,202			191,775		553,862			633,030
Provision for income taxes		70,087			61,883		158,749			200,159
Net earnings		178,115			129,892		395,113			432,871
Earnings attributable to noncontrolling interests		30,518			19,584		77,582			65,160
Net earnings attributable to Nucor stockholders	$	147,597		$	110,308	$	317,531		$	367,711
Net earnings per share:
Basic	$	0.46		$	0.35	$	0.99		$	1.15
Diluted	$	0.46		$	0.35	$	0.99		$	1.15
Average shares outstanding:
Basic		319,341			318,463		318,979			318,042
Diluted		319,526			318,520		319,132			318,113
Dividends declared per share	$	0.3675		$	0.3650	$	1.1025		$	1.0950

See notes to condensed consolidated financial statements.

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Nucor Corporation Condensed Consolidated Statements of Comprehensive Income (Unaudited)

(In thousands)

	Three Months (13 Weeks) Ended						Nine Months (39 Weeks) Ended
	Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013			Sept. 29, 2012
Net earnings	$	178,115		$	129,892		$	395,113		$	432,871
Other comprehensive income (loss):
Net unrealized loss on hedging derivatives, net of income taxes of $0 and $0 for the third quarter of 2013 and 2012, respectively, and $0 and $1,100 for the first nine months of 2013 and 2012, respectively		—			—			—			(2,264	)
Reclassification adjustment for loss on settlement of hedging derivatives included in net income, net of income taxes of $0 and $6,200 for the third quarter of 2013 and 2012, respectively, and $0 and $18,800 for the first nine months of 2013 and 2012, respectively		—			10,554			—			31,961
Foreign currency translation gain (loss), net of income taxes of $500 and $0 for the third quarter of 2013 and 2012, respectively, and $300 and $0 for the first nine months of 2013 and 2012, respectively		31,879			61,111			(34,216	)		59,730
		31,879			71,665			(34,216	)		89,427
Comprehensive income		209,994			201,557			360,897			522,298
Comprehensive income attributable to noncontrolling interests		(30,518	)		(19,585	)		(77,582	)		(65,097	)
Comprehensive income attributable to Nucor stockholders	$	179,476		$	181,972		$	283,315		$	457,201

See notes to condensed consolidated financial statements.

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Nucor Corporation Condensed Consolidated Balance Sheets (Unaudited)

(In thousands)

	Sept. 28, 2013			Dec. 31, 2012
ASSETS
Current assets:
Cash and cash equivalents	$	1,722,909		$	1,052,862
Short-term investments		48,476			104,167
Accounts receivable, net		1,918,165			1,707,317
Inventories, net		2,439,847			2,323,641
Other current assets		339,480			473,377
Total current assets		6,468,877			5,661,364
Property, plant and equipment, net		4,697,339			4,283,056
Restricted cash and investments		393			275,163
Goodwill		1,983,617			2,004,538
Other intangible assets, net		896,407			959,240
Other assets		1,045,143			968,698
Total assets	$	15,091,776		$	14,152,059
LIABILITIES
Current liabilities:
Short-term debt	$	38,203		$	29,912
Long-term debt due within one year		—			250,000
Accounts payable		1,137,352			1,046,713
Salaries, wages and related accruals		288,730			279,898
Accrued expenses and other current liabilities		529,204			423,045
Total current liabilities		1,993,489			2,029,568
Long-term debt due after one year		4,380,200			3,380,200
Deferred credits and other liabilities		854,814			856,917
Total liabilities		7,228,503			6,266,685
EQUITY
Nucor stockholders’ equity:
Common stock		150,968			150,805
Additional paid-in capital		1,841,499			1,811,459
Retained earnings		7,088,630			7,124,523
Accumulated other comprehensive income, net of income taxes		22,545			56,761
Treasury stock		(1,498,436	)		(1,501,977	)
Total Nucor stockholders’ equity		7,605,206			7,641,571
Noncontrolling interests		258,067			243,803
Total equity		7,863,273			7,885,374
Total liabilities and equity	$	15,091,776		$	14,152,059

See notes to condensed consolidated financial statements.

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Nucor Corporation Condensed Consolidated Statements of Cash Flows (Unaudited)

(In thousands)

	Nine Months (39 Weeks) Ended
	Sept. 28, 2013			Sept. 29, 2012
Operating activities:
Net earnings	$	395,113		$	432,871
Adjustments:
Depreciation		390,495			394,690
Amortization		56,051			53,518
Stock-based compensation		40,551			42,858
Deferred income taxes		10,881			(42,548	)
Distribution from affiliates		7,708			—
Equity in (earnings) losses of unconsolidated affiliates		(2,665	)		9,093
Impairment of non-current assets		—			30,000
Loss on assets		14,000			17,563
Changes in assets and liabilities (exclusive of acquisitions and dispositions):
Accounts receivable		(204,540	)		62,787
Inventories		(129,280	)		41,662
Accounts payable		122,520			21,668
Federal income taxes		70,210			11,248
Salaries, wages and related accruals		12,796			(52,561	)
Other		99,800			101,835
Cash provided by operating activities		883,640			1,124,684
Investing activities:
Capital expenditures		(887,929	)		(613,777	)
Investment in and advances to affiliates		(64,762	)		(66,423	)
Repayment of advances to affiliates		42,000			32,500
Disposition of plant and equipment		29,328			42,574
Acquisitions (net of cash acquired)		—			(763,657	)
Purchases of investments		(19,349	)		(409,403	)
Proceeds from the sale of investments		73,428			1,341,913
Proceeds from the sale of restricted investments		148,725			209,930
Changes in restricted cash		126,045			(38,301	)
Other investing		4,862			—
Cash used in investing activities		(547,652	)		(264,644	)
Financing activities:
Net change in short-term debt		8,331			28,983
Proceeds from long-term debt, net of discount		999,100			—
Repayment of long-term debt		(250,000	)		—
Bond issuance costs		(7,625	)		—
Issuance of common stock		—			10,515
Excess tax benefits from stock-based compensation		2,100			4,377
Distributions to noncontrolling interests		(63,318	)		(66,562	)
Cash dividends		(353,155	)		(349,538	)
Other financing activities		110			962
Cash provided by (used in) financing activities		335,543			(371,263	)
Effect of exchange rate changes on cash		(1,484	)		3,775
Increase in cash and cash equivalents		670,047			492,552
Cash and cash equivalents—beginning of year		1,052,862			1,200,645
Cash and cash equivalents—end of nine months	$	1,722,909		$	1,693,197
Non-cash investing activity:
Change in accrued plant and equipment purchases	$	(30,416	)	$	77,764

See notes to condensed consolidated financial statements.

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Nucor Corporation – Notes to Condensed Consolidated Financial Statements (Unaudited)

1. BASIS OF INTERIM PRESENTATION: The information furnished in Item 1 reflects all adjustments which are, in the opinion of management, necessary to a fair statement of the results for the interim periods and are of a normal and recurring nature unless otherwise noted. The information furnished has not been audited; however, the December 31, 2012 condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America. The unaudited condensed consolidated financial statements in this Item 1 should be read in conjunction with the consolidated financial statements and the notes thereto included in Nucor’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012.

Recently Adopted Accounting Pronouncements — In the first quarter of 2013, Nucor adopted new accounting guidance requiring additional disclosures on reclassifications from accumulated other comprehensive income into net income. The new accounting guidance requires entities to report either parenthetically on the face of the financial statements or in the notes to the financial statements these reclassifications for each financial statement line item. Nucor elected to report this information within the notes to the financial statements. This new guidance only impacts disclosures and has no impact on Nucor’s consolidated financial position, results of operations or cash flows.

In the first quarter of 2014, Nucor will adopt new accounting guidance which requires unrecognized tax benefits to be presented as a decrease in net operating loss, similar tax loss or tax credit carryforward if certain criteria are met. The new guidance may affect balance sheet classification of certain unrecognized tax benefits and will have no impact on Nucor’s consolidated results of operations or cash flows.

2. INVENTORIES: Inventories consisted of approximately 40% raw materials and supplies and 60% finished and semi-finished products at September 28, 2013 (37% and 63%, respectively, at December 31, 2012). Nucor’s manufacturing process consists of a continuous, vertically integrated process from which products are sold to customers at various stages throughout the process. Since most steel products can be classified as either finished or semi-finished products, these two categories of inventory are combined.

Inventories valued using the last-in, first-out (LIFO) method of accounting represented approximately 44% of total inventories as of September 28, 2013 (45% as of December 31, 2012). If the first-in, first-out (FIFO) method of accounting had been used, inventories would have been $607.2 million higher at both September 28, 2013 and December 31, 2012. Use of the lower of cost or market methodology reduced inventories by $2.7 million at September 28, 2013 ($3.5 million at December 31, 2012).

3. PROPERTY, PLANT AND EQUIPMENT: Property, plant and equipment was recorded net of accumulated depreciation of $6.52 billion at September 28, 2013 ($6.16 billion at December 31, 2012).

In the third quarter of 2013, a storage dome collapsed at Nucor Steel Louisiana in St. James Parish. As a result, Nucor recorded a partial write down of assets at the facility, including $21.0 million of property, plant and equipment and $7.0 million of inventory, offset by a $14.0 million insurance receivable that was based on management’s estimate of probable insurance recoveries. The associated net charge of $14.0 million is included in marketing, administrative and other expenses in the condensed consolidated statement of earnings.

4. RESTRICTED CASH AND INVESTMENTS: As of September 28, 2013, restricted cash consisted of net proceeds from $600.0 million 30-year variable rate Gulf Opportunity Zone bonds issued in November 2010. The restricted cash is held in a trust account and is to be used to fund part of the capital costs

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associated with the construction of Nucor’s direct reduced iron making facility in St. James Parish, Louisiana. Funds are disbursed as qualified expenditures for the construction of the facility are made ($274.9 million and $172.6 million in the first nine months of 2013 and 2012, respectively). There were no restricted investments held as of September 28, 2013 ($149.8 million at December 31, 2012). Since the restricted cash must be used for the construction of the facility, the entire balance has been classified as a non-current asset.

5. GOODWILL AND OTHER INTANGIBLE ASSETS: The change in the net carrying amount of goodwill for the nine months ended September 28, 2013 by segment is as follows (in thousands):

	Steel Mills		Steel Products			Raw Materials		All Other			Total
Balance at December 31, 2012	$	407,045	$	805,416		$	703,225	$	88,852		$	2,004,538
Acquisitions		—		—			—		—			—
Reclassifications		88,852		—			—		(88,852	)		—
Translation		—		(16,059	)		—		—			(16,059	)
Other		—		(4,862	)		—		—			(4,862	)
Balance at September 28, 2013	$	495,897	$	784,495		$	703,225	$	—		$	1,983,617

Previously Nucor’s steel trading businesses and rebar distribution businesses were reported in the “All other” category. Beginning in the first quarter of 2013, these businesses were reclassified to the steel mills segment as part of a realignment of Nucor’s reportable segments to better reflect the way in which they are managed.

Nucor completed its most recent annual goodwill impairment testing during the fourth quarter of 2012 and concluded that there was no impairment of goodwill for any of its reporting units. There have been no triggering events requiring an interim assessment for impairment since the most recent annual impairment testing date.

Intangible assets with estimated useful lives of three to 22 years are amortized on a straight-line or accelerated basis and were comprised of the following (in thousands):

	Sept. 28, 2013				Dec. 31, 2012
	Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
Customer relationships	$	1,151,156	$	375,128	$	1,156,979	$	325,819
Trademarks and trade names		151,909		38,513		152,869		32,653
Other		21,869		14,886		28,610		20,746
	$	1,324,934	$	428,527	$	1,338,458	$	379,218

Intangible asset amortization expense in the third quarter of 2013 and 2012 was $18.5 million and $20.4 million, respectively, and was $56.1 million and $53.5 million in the first nine months of 2013 and 2012, respectively. Annual amortization expense is estimated to be $73.9 million in 2013; $70.0 million in 2014; $68.2 million in 2015; $66.5 million in 2016; and $64.8 million in 2017.

6. EQUITY INVESTMENTS: The carrying value of our equity investments in domestic and foreign companies was $913.7 million at September 28, 2013 ($855.9 million at December 31, 2012) and is recorded in other assets in the condensed consolidated balance sheets.

DUFERDOFIN NUCOR

Nucor owns a 50% economic and voting interest in Duferdofin Nucor S.r.l. (Duferdofin Nucor), an Italian steel manufacturer, and accounts for the investment (on a one-month lag basis) under the equity method, as control and risk of loss are shared equally between the members.

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Nucor’s investment in Duferdofin Nucor at September 28, 2013 was $454.6 million ($454.1 million at December 31, 2012). Nucor’s 50% share of the total net assets of Duferdofin Nucor was $50.7 million at September 28, 2013, resulting in a basis difference of $403.9 million due to the step-up to fair value of certain assets and liabilities attributable to Duferdofin Nucor as well as the identification of goodwill ($326.2 million) and finite-lived intangible assets. This basis difference, excluding the portion attributable to goodwill, is being amortized based on the remaining estimated useful lives of the various underlying net assets, as appropriate. Amortization expense and other purchase accounting adjustments associated with the fair value step-up were $2.8 million and $2.7 million in the third quarter of 2013 and 2012, respectively, and were $8.5 million and $8.3 million in the first nine months of 2013 and 2012, respectively.

As of September 28, 2013, Nucor had outstanding notes receivable of €35.0 million ($47.3 million) from Duferdofin Nucor (€35.0 million at December 31, 2012). The notes receivable bear interest at 1.69% and reset annually on September 30 to the twelve-month Euro Interbank Offered Rate (Euribor) plus 1% per year. The principal amounts are due on January 31, 2016. Accordingly, the notes receivable were classified in other assets on the condensed consolidated balance sheets as of September 28, 2013.

Nucor has issued a guarantee for its ownership percentage (50%) of Duferdofin Nucor’s borrowings under Facility A of a Structured Trade Finance Facilities Agreement that matures on April 26, 2016. In the second quarter of 2013, Duferdofin Nucor amended the loan agreement, increasing the maximum amount that it can borrow under Facility A to €122.5 million (or $164.8 million as of September 28, 2013). As of September 28, 2013, it had €106.0 million ($143.2 million) outstanding under that facility (€102.0 million, or $134.8 million, at December 31, 2012). If Duferdofin Nucor fails to pay when due any amounts for which it is obligated under Facility A, Nucor could be required to pay 50% of such amounts pursuant to and in accordance with the terms of its guarantee. Any indebtedness of Duferdofin Nucor to Nucor is effectively subordinated to the indebtedness of Duferdofin Nucor under the Structured Trade Finance Facilities Agreement. Nucor has not recorded any liability associated with the guarantee.

NUMIT

Nucor has a 50% economic and voting interest in NuMit LLC (NuMit). NuMit owns 100% of the equity interest in Steel Technologies LLC, an operator of 24 sheet processing facilities located throughout the U.S., Canada and Mexico. Nucor accounts for the investment in NuMit (on a one-month lag basis) under the equity method as control and risk of loss are shared equally between the members.

Nucor’s investment in NuMit at September 28, 2013 was $308.4 million ($288.4 million as of December 31, 2012). The value of the investment is comprised of the purchase price of approximately $221.3 million plus subsequent additional capital contributions and equity method earnings less distributions since acquisition. Nucor also has recorded a $40.0 million note receivable from Steel Technologies LLC that bears interest at 1.17% as of September 28, 2013 and resets quarterly to the three-month London Interbank Offered Rate (LIBOR) plus 90 basis points. The principal amount is due on October 21, 2014. In addition, Nucor has extended a $100.0 million line of credit (of which $16.5 million was outstanding at September 28, 2013) to Steel Technologies LLC. As of September 28, 2013, the amounts outstanding on the line of credit bear interest at 1.20% to 1.21% and mature on April 1, 2014. The note receivable was classified in other assets and the amount outstanding on the line of credit was classified in other current assets in the condensed consolidated balance sheets.

HUNTER RIDGE

In November 2012, Nucor acquired a 50% economic and voting interest in Hunter Ridge Energy Services LLC (Hunter Ridge). Hunter Ridge provides services for the gathering, separation and compression of energy products including natural gas produced by Nucor’s working interest drilling program. Nucor accounts for the investment (on a one-month lag basis) under the equity

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method, as control and risk of loss are shared equally between the members. Nucor’s investment in Hunter Ridge at September 28, 2013 was $132.9 million ($95.4 million at December 31, 2012). The acquisition did not result in a significant amount of goodwill or intangible assets.

ALL EQUITY INVESTMENTS

Nucor reviews its equity investments for impairment if and when circumstances indicate that a decline in value below their carrying amounts may have occurred. In the second quarter of 2012, Nucor concluded that a triggering event occurred, requiring assessment for impairment of the equity investment in Duferdofin Nucor due to the continued declines in the global demand for steel, the escalated economic and political turmoil in Europe and continued operating performance well below budgeted levels through the first half of 2012. Duferdofin Nucor had a recently updated unfavorable forecast of future operating performance that was also a contributing factor. The diminished demand combined with the continued lower than budgeted levels of operating performance significantly impacted the financial results of Duferdofin Nucor through the first half of 2012. After completing its assessment, Nucor determined that the carrying amount exceeded its estimated fair value and recorded a $30.0 million impairment charge against the Company’s investment in Duferdofin Nucor.

In the fourth quarter of 2012, Nucor assessed its equity investment in Duferdofin Nucor for impairment. After completing its assessment, the Company determined that the estimated fair value exceeded its carrying amount and that there was no need for additional impairment charges. There has been no significant deterioration in near-term financial projections or any other key assumptions since the most recent impairment analysis was performed. The assumptions that most significantly affect the fair value determination include projected revenues and the discount rate. Steel market conditions in Europe have continued to be challenging through the third quarter of 2013, and, therefore, it is reasonably possible that material deviation of future performance from the estimates used in our most recent valuation could result in further impairment of our investment in Duferdofin Nucor.

7. CURRENT LIABILITIES: Book overdrafts, included in accounts payable in the condensed consolidated balance sheets, were $103.2 million at September 28, 2013 ($53.8 million at December 31, 2012). Dividends payable, included in accrued expenses and other current liabilities in the condensed consolidated balance sheets, were $117.8 million at September 28, 2013 ($117.6 million at December 31, 2012).

8. DERIVATIVES: Nucor periodically uses derivative financial instruments primarily to partially manage its exposure to price risk related to natural gas purchases used in the production process as well as to scrap, copper and aluminum purchased for resale to its customers. In addition, Nucor periodically uses derivatives to partially manage its exposure to changes in interest rates on outstanding debt instruments and uses forward foreign exchange contracts to hedge cash flows associated with certain assets and liabilities, firm commitments and anticipated transactions.

Nucor recognizes all derivative instruments in the condensed consolidated balance sheets at fair value. Any resulting changes in fair value are recorded as adjustments to other comprehensive income (loss), net of tax, or recognized in net earnings, as appropriate.

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The following tables summarize information regarding Nucor’s derivative instruments (in thousands):

Fair Value of Derivative Instruments

		Fair Value at
	Balance Sheet Location	Sept. 28, 2013			Dec. 31, 2012
Liability derivatives not designated as hedging instruments:
Commodity contracts	Accrued expenses and other current liabilities	$	(453	)	$	(303	)
Foreign exchange contracts	Accrued expenses and other current liabilities		(34	)		(15	)
Total liability derivatives		$	(487	)	$	(318	)

The Effect of Derivative Instruments on the Condensed Consolidated Statements of Earnings

Derivatives Designated as Hedging Instruments

			Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)				Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)					Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion)
Derivatives in Cash Flow Hedging Relationships
	Statement of  Earnings Location		Three Months (13 weeks) Ended				Three Months (13 weeks) Ended					Three Months (13 weeks) Ended
			Sept. 28, 2013		Sept. 29, 2012		Sept. 28, 2013		Sept. 29, 2012			Sept. 28, 2013		Sept. 29, 2012
Commodity contracts		Cost of products sold	$	—	$	—	$	—	$	(10,554	)	$	—	$	—

			Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)					Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)					Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion)
Derivatives in Cash Flow Hedging Relationships
	Statement of  Earnings Location		Nine Months (39 weeks) Ended					Nine Months (39 weeks) Ended					Nine Months (39 weeks) Ended
			Sept. 28, 2013		Sept. 29, 2012			Sept. 28, 2013		Sept. 29, 2012			Sept. 28, 2013		Sept. 29, 2012
Commodity contracts		Cost of products sold	$	—	$	(2,264	)	$	—	$	(31,961	)	$	—	$	500

Derivatives Not Designated as Hedging Instruments

			Amount of Gain or (Loss) Recognized in Earnings on  Derivatives
			Three Months (13 weeks) Ended						Nine Months (39 weeks) Ended
Derivatives Not Designated as Hedging Instruments	Statement of Earnings Location		Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013		Sept. 29, 2012
Commodity contracts		Cost of products sold	$	(789	)	$	(1,454	)	$	4,193	$	(231	)
Foreign exchange contracts		Cost of products sold		134			(25	)		253		146
Total			$	(655	)	$	(1,479	)	$	4,446	$	(85	)

During the first quarter of 2012, Nucor settled all of its open natural gas forward purchase contracts that were previously in place. These settlements affected earnings over the periods specified in the original agreements throughout the remainder of 2012.

9. FAIR VALUE MEASUREMENTS: The following table summarizes information regarding Nucor’s financial assets and financial liabilities that were measured at fair value as of September 28, 2013 and December 31, 2012 (in thousands). Nucor does not currently have any non-financial assets or liabilities that are measured at fair value on a recurring basis.

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				Fair Value Measurements at Reporting Date Using
Description	Carrying Amount in Condensed Consolidated Balance Sheets			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
As of September 28, 2013
Assets:
Cash equivalents	$	1,590,572		$	1,590,572	$	—		$	—
Short-term investments		48,476			48,476		—			—
Restricted cash		393			393		—			—
Total assets	$	1,639,441		$	1,639,441	$	—		$	—
Liabilities:
Foreign exchange and commodity contracts	$	(487	)	$	—	$	(487	)	$	—
As of December 31, 2012
Assets:
Cash equivalents	$	830,011		$	830,011	$	—		$	—
Short-term investments		104,167			104,167		—			—
Restricted cash and investments		275,163			275,163		—			—
Total assets	$	1,209,341		$	1,209,341	$	—		$	—
Liabilities:
Foreign exchange and commodity contracts	$	(318	)	$	—	$	(318	)	$	—

Fair value measurements for Nucor’s cash equivalents, short-term investments and restricted cash and investments are classified under Level 1 because such measurements are based on quoted market prices in active markets for identical assets. Our short-term investments are held in similar short-term investment instruments as described in Note 4 to Nucor’s annual report for the year ended December 31, 2012. Fair value measurements for Nucor’s derivatives are classified under Level 2 because such measurements are based on published market prices for similar assets or are estimated based on observable inputs such as interest rates, yield curves, credit risks, spot and future commodity prices, and spot and future exchange rates.

The fair value of short-term and long-term debt, including current maturities, was approximately $4.62 billion at September 28, 2013 ($4.24 billion at December 31, 2012). The debt fair value estimates are classified under Level 2 because such estimates are based on readily available market prices of our debt at September 28, 2013 and December 31, 2012, or similar debt with the same maturities, rating and interest rates.

10. CONTINGENCIES: Nucor is subject to environmental laws and regulations established by federal, state and local authorities and, accordingly, makes provision for the estimated costs of compliance. Of the undiscounted total of $23.7 million of accrued environmental costs at September 28, 2013 ($26.5 million at December 31, 2012), $7.7 million was classified in accrued expenses and other current liabilities ($9.5 million at December 31, 2012) and $16.0 million was classified in deferred credits and other liabilities ($17.0 million at December 31, 2012). Inherent uncertainties exist in these estimates primarily due to unknown conditions, evolving remediation technology, and changing governmental regulations and legal standards.

Nucor has been named, along with other major steel producers, as a co-defendant in several related antitrust class-action complaints filed by Standard Iron Works and other steel purchasers in the United States District Court for the Northern District of Illinois. The majority of these

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complaints were filed in September and October of 2008, with two additional complaints being filed in July and December of 2010. Two of these complaints have been voluntarily dismissed and are no longer pending. The plaintiffs allege that from April 1, 2005 through December 31, 2007, eight steel manufacturers, including Nucor, engaged in anticompetitive activities with respect to the production and sale of steel. The plaintiffs seek monetary and other relief. Although we believe the plaintiffs’ claims are without merit and will vigorously defend against them, we cannot at this time predict the outcome of this litigation or estimate the range of Nucor’s potential exposure.

We are from time to time a party to various lawsuits, claims, and other legal proceedings that arise in the ordinary course of business. With respect to all such lawsuits, claims and proceedings, we record reserves when it is probable a liability has been incurred and the amount of loss can be reasonably estimated. We do not believe that any of these proceedings, individually or in the aggregate, would be expected to have a material adverse effect on our results of operations, financial position or cash flows. Nucor maintains liability insurance for certain risks that is subject to certain self-insurance limits.

11. DEBT – On July 29, 2013, Nucor issued $500.0 million of 4.00% notes due in 2023 and $500.0 million of 5.20% notes due in 2043. Net proceeds of the issuances were $991.5 million. Costs of $8.5 million associated with the issuances have been capitalized and are amortized over the life of the notes.

During the third quarter of 2013, Nucor amended its $1.50 billion unsecured revolving credit facility. The maturity date was extended from December 2016 to August 2018. Costs of $0.6 million associated with the amendment have been capitalized and are amortized over the life of the extension.

12. STOCK-BASED COMPENSATION: Stock Options – Stock options may be granted to Nucor’s key employees, officers and non-employee directors with exercise prices at 100% of the market value on the date of the grant. The stock options granted from 2010 through 2013 are exercisable at the end of three years and have a term of 10 years. All stock options granted prior to 2010 were fully exercised as of September 28, 2013. New shares are issued upon exercise of stock options.

A summary of activity under Nucor’s stock option plans for the first nine months of 2013 is as follows (in thousands, except year and per share amounts):

	Shares		Weighted - Average Exercise Price		Weighted - Average Remaining Contractual Life		Aggregate Intrinsic Value
Number of shares under option:
Outstanding at beginning of year		1,543	$	39.03
Granted		546	$	44.51
Exercised		—		—
Canceled		—		—
Outstanding at September 28, 2013		2,089	$	40.47		8.4 years	$	17,409
Options exercisable at September 28, 2013		242	$	41.43		6.7 years	$	1,783

All expense related to options had been recognized as of the end of the second quarter of 2013. Compensation expense for stock options was $0.3 million in the third quarter of 2012, and $8.6 million and $9.5 million in the first nine months of 2013 and 2012, respectively.

Restricted Stock Units – Nucor annually grants restricted stock units (“RSUs”) to key employees, officers and non-employee directors. The RSUs typically vest and are converted to common stock in three equal installments on each of the first three anniversaries of the grant date. A portion of

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the RSUs awarded to senior officers vest upon the officer’s retirement. Retirement, for purposes of vesting in these RSUs only, means termination of employment with approval of the Compensation and Executive Development Committee of the Board of Directors after satisfying age and years of service requirements. RSUs granted to non-employee directors are fully vested on the grant date and are payable to the non-employee director in the form of common stock after the termination of the director’s service on the board of directors.

RSUs granted to employees who are eligible for retirement on the date of grant are expensed immediately, and RSUs granted to employees who will become retirement-eligible prior to the end of the vesting term are expensed over the period through which the employee will become retirement-eligible since these awards vest upon retirement from the Company. Compensation expense for RSUs granted to employees who are not retirement-eligible is recognized on a straight-line basis over the vesting period.

Cash dividend equivalents are paid to participants each quarter. Dividend equivalents paid on units expected to vest are recognized as a reduction in retained earnings.

The fair value of the RSUs is determined based on the closing stock price of Nucor’s common stock on the day before the grant. A summary of Nucor’s RSU activity for the first nine months of 2013 is as follows (shares in thousands):

	Shares			Grant Date Fair Value
Restricted stock units:
Unvested at beginning of year		1,106		$	40.80
Granted		789		$	44.51
Vested		(753	)	$	42.17
Canceled		(11	)	$	39.08
Unvested at September 28, 2013		1,131		$	42.49
Shares reserved for future grants (stock options and RSUs)		10,499

Compensation expense for RSUs was $5.3 million and $4.7 million in the third quarter of 2013 and 2012, respectively, and $27.5 million and $29.6 million in the first nine months of 2013 and 2012, respectively. As of September 28, 2013, unrecognized compensation expense related to unvested RSUs was $34.2 million, which is expected to be recognized over a weighted-average period of 2.3 years.

Restricted Stock Awards – Nucor’s Senior Officers Long-Term Incentive Plan (the “LTIP”) and Annual Incentive Plan (the “AIP”) authorize the award of shares of common stock to officers subject to certain conditions and restrictions.

The LTIP provides for the award of shares of restricted common stock at the end of each LTIP performance measurement period at no cost to officers if certain financial performance goals are met during the period. One-third of the LTIP restricted stock award vests upon each of the first three anniversaries of the award date or, if earlier, upon the officer’s attainment of age fifty-five while employed by Nucor. Although participants are entitled to cash dividends and may vote such awarded shares, the sale or transfer of such shares is limited during the restricted period.

The AIP provides for the payment of annual cash incentive awards. An AIP participant may elect, however, to defer payment of up to one-half of an annual incentive award. In such event, the deferred AIP award is converted into common stock units and credited with a deferral incentive, in the form of additional common stock units, equal to 25% of the number of common stock units

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attributable to the deferred AIP award. Common stock units attributable to deferred AIP awards are fully vested. Common stock units credited as a deferral incentive vest upon the AIP participant’s attainment of age fifty-five while employed by Nucor. Vested common stock units are paid to AIP participants in the form of shares of common stock following their termination of employment with Nucor.

A summary of Nucor’s restricted stock activity under the AIP and LTIP for the first nine months of 2013 is as follows (shares in thousands):

	Shares			Grant Date Fair Value
Restricted stock awards and units:
Unvested at beginning of year		72		$	43.72
Granted		122		$	47.36
Vested		(121	)	$	46.32
Canceled		—			—
Unvested at September 28, 2013		73		$	45.49
Shares reserved for future grants		1,238

Compensation expense for common stock and common stock units awarded under the AIP and LTIP is recorded over the performance measurement and vesting periods based on the anticipated number and market value of shares of common stock and common stock units to be awarded. Compensation expense for anticipated awards based upon Nucor’s financial performance, exclusive of amounts payable in cash, was $1.2 million and $0.5 million in the third quarter of 2013 and 2012, respectively, and $4.5 million and $3.6 million in the first nine months of 2013 and 2012, respectively. At September 28, 2013, unrecognized compensation expense related to unvested restricted stock awards was $0.9 million, which is expected to be recognized over a weighted-average period of 1.8 years.

13. EMPLOYEE BENEFIT PLAN: Nucor makes contributions to a Profit Sharing and Retirement Savings Plan for qualified employees based on the profitability of the Company. Nucor’s expense for these benefits was $22.5 million and $17.5 million in the third quarter of 2013 and 2012, respectively, and was $49.2 million and $58.1 million in the first nine months of 2013 and 2012, respectively. The related liability for these benefits is included in salaries, wages and related accruals.

14. INTEREST EXPENSE (INCOME): The components of net interest expense are as follows (in thousands):

	Three Months (13 Weeks) Ended						Nine Months (39 Weeks) Ended
	Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013			Sept. 29, 2012
Interest expense	$	38,621		$	42,954		$	112,978		$	132,254
Interest income		(1,154	)		(2,649	)		(3,792	)		(9,226	)
Interest expense, net	$	37,467		$	40,305		$	109,186		$	123,028

15. INCOME TAXES: The effective tax rate for the third quarter of 2013 was 28.2% compared to 32.3% for the third quarter of 2012. The decrease in the effective tax rate for the third quarter of 2013 as compared to the third quarter of 2012 is primarily due to the change in relative proportions of net earnings attributable to noncontrolling interests to total pre-tax earnings between the periods and the impact of the reversal of tax reserves due to closing of the statute of limitations in the third quarter of 2013. Nucor has concluded U.S. federal income tax matters for years through 2009. The

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2010 to 2012 tax years are open to examination by the Internal Revenue Service. The tax years 2010 through 2012 remain open to examination by other major taxing jurisdictions to which Nucor is subject (primarily Canada and other state and local jurisdictions).

Current deferred tax assets included in other current assets were $181.4 million at September 28, 2013 ($190.4 million at December 31, 2012). Current deferred tax liabilities included in accrued expenses and other current liabilities were $13.6 million at September 28, 2013 (none at December 31, 2012). Non-current deferred tax liabilities included in deferred credits and other liabilities were $556.8 million at September 28, 2013 ($566.1 million at December 31, 2012).

16. STOCKHOLDERS’ EQUITY: The following tables reflect the changes in stockholders’ equity attributable to both Nucor and the noncontrolling interests of Nucor’s joint ventures, primarily Nucor-Yamato Steel Company, of which Nucor owns 51% (in thousands):

	Attributable to Nucor Corporation			Attributable to Noncontrolling Interests			Total
Stockholders’ equity at December 31, 2012	$	7,641,571		$	243,803		$	7,885,374
Total comprehensive income		283,315			77,582			360,897
Stock options		8,575			—			8,575
Issuance of stock under award plans, net of forfeitures		24,568			—			24,568
Amortization of unearned compensation		601			—			601
Dividends declared		(353,424	)		—			(353,424	)
Distributions to noncontrolling interests		—			(63,318	)		(63,318	)
Stockholders’ equity at September 28, 2013	$	7,605,206		$	258,067		$	7,863,273
	Attributable to Nucor Corporation			Attributable to Noncontrolling Interests			Total
Stockholders’ equity at December 31, 2011	$	7,474,885		$	231,695		$	7,706,580
Total comprehensive income		457,201			65,097			522,298
Stock options		20,052			—			20,052
Issuance of stock under award plans, net of forfeitures		31,292			—			31,292
Amortization of unearned compensation		600			—			600
Dividends declared		(350,041	)		—			(350,041	)
Distributions to noncontrolling interests		—			(66,562	)		(66,562	)
Other		(645	)					(645	)
Stockholders’ equity at September 29, 2012	$	7,633,344		$	230,230		$	7,863,574

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17. ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME: The following tables reflect the changes in accumulated other comprehensive (loss) income by component (in thousands):

	Three Month (13 week) Period Ended September 28, 2013
	Gains and Losses on Hedging Derivatives		Foreign Currency Gain (Loss)			Adjustment to Early Retiree Medical Plan		Total
June 29, 2013	$	—	$	(19,914	)	$	10,580	$	(9,334	)
Other comprehensive (loss) income before reclassifications		—		31,879			—		31,879
Amounts reclassified from accumulated other comprehensive (loss) income into earnings		—		—			—		—
Net current-period other comprehensive (loss) income		—		31,879			—		31,879
September 28, 2013	$	—	$	11,965		$	10,580	$	22,545
	Nine Month (39 week) Period Ended September 28, 2013
	Gains and Losses on Hedging Derivatives		Foreign Currency Gain (Loss)			Adjustment to Early Retiree Medical Plan		Total
December 31, 2012	$	—	$	46,181		$	10,580	$	56,761
Other comprehensive (loss) income before reclassifications		—		(34,216	)		—		(34,216	)
Amounts reclassified from accumulated other comprehensive (loss) income into earnings		—		—			—		—
Net current-period other comprehensive (loss) income		—		(34,216	)		—		(34,216	)
September 28, 2013	$	—	$	11,965		$	10,580	$	22,545

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	Three Month (13 week) Period Ended September 29, 2012
	Gains and Losses on Hedging Derivatives			Foreign Currency Gain (Loss)			Adjustment to Early Retiree Medical Plan		Total
June 30, 2012	$	(21,107	)	$	(13,628	)	$	14,384	$	(20,351	)
Other comprehensive (loss) income before reclassifications		—			61,111			—		61,111
Amounts reclassified from accumulated other comprehensive (loss) income into earnings (1)		10,554			—			—		10,554
Net current-period other comprehensive (loss) income		10,554			61,111			—		71,665
Other					(1	)				(1	)
September 29, 2012	$	(10,553	)	$	47,482		$	14,384	$	51,313

1 - Includes $10,554 net-of-tax impact of accumulated other comprehensive income reclassifications into Cost of Products Sold for net losses on commodity contracts. The tax impact of this reclassification was $6,200.

	Nine Month (39 week) Period Ended September 29, 2012
	Gains and Losses on Hedging Derivatives			Foreign Currency Gain (Loss)			Adjustment to Early Retiree Medical Plan		Total
December 31, 2011	$	(40,250	)	$	(12,311	)	$	14,384	$	(38,177	)
Other comprehensive (loss) income before reclassifications		(2,264	)		59,730			—		57,466
Amounts reclassified from accumulated other comprehensive (loss) income into earnings (1)		31,961			—			—		31,961
Net current-period other comprehensive (loss) income		29,697			59,730			—		89,427
Other		—			63			—		63
September 29, 2012	$	(10,553	)	$	47,482		$	14,384	$	51,313

1 - Includes $31,961 net-of-tax impact of accumulated other comprehensive income reclassifications into Cost of Products Sold for net losses on commodity contracts. The tax impact of this reclassification was $18,800.

18. SEGMENTS: Nucor reports its results in the following segments: steel mills, steel products and raw materials. The steel mills segment includes carbon and alloy steel in sheet, bars, structural and plate; steel trading businesses; rebar distribution businesses; and Nucor’s equity method investments in Duferdofin Nucor and NuMit. The steel products segment includes steel joists and

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joist girders, steel deck, fabricated concrete reinforcing steel, cold finished steel, steel fasteners, metal building systems, steel grating and expanded metal, and wire and wire mesh. The raw materials segment includes DJJ, a scrap broker and processor; Nu-Iron Unlimited, a facility that produces DRI used by the steel mills; a DRI facility under construction in Louisiana; our natural gas working interests; and Nucor’s equity method investment in Hunter Ridge. Previously Nucor’s steel trading businesses and rebar distribution businesses were reported in an “All other” category. Beginning in the first quarter of 2013, these businesses were reclassified to the steel mills segment as part of a realignment of Nucor’s reportable segments to better reflect the way in which they are managed. The segment data for the comparable period has also been reclassified into the steel mills segment in order to conform to the current year presentation. The steel mills, steel products and raw materials segments are consistent with the way Nucor manages its business, which is primarily based upon the similarity of the types of products produced and sold by each segment. Additionally, the composition of assets by segment at December 31, 2012 was reclassified during the third quarter of 2013 to conform with the current quarter presentation. This reclassification between segments did not have any impact on the consolidated asset balances.

Net interest expense, other income, profit sharing expense, stock-based compensation and changes in the LIFO reserve are shown under Corporate/eliminations. Corporate assets primarily include cash and cash equivalents, short-term investments, restricted cash and investments, allowances to eliminate intercompany profit in inventory, fair value of natural gas hedges, deferred income tax assets, federal and state income taxes receivable, the LIFO reserve and investments in and advances to affiliates.

Nucor’s results by segment were as follows (in thousands):

	Three Months (13 Weeks) Ended						Nine Months (39 Weeks) Ended
	Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013			Sept. 29, 2012
Net sales to external customers:
Steel mills	$	3,435,884		$	3,319,518		$	9,901,471		$	10,682,810
Steel products		964,153			1,006,366			2,690,604			2,840,055
Raw materials		540,899			475,322			1,565,221			1,455,134
	$	4,940,936		$	4,801,206		$	14,157,296		$	14,977,999
Intercompany sales:
Steel mills	$	652,077		$	670,876		$	1,924,222		$	1,997,879
Steel products		24,909			17,179			75,036			52,958
Raw materials		2,391,502			2,080,150			6,738,485			7,441,529
Corporate/eliminations		(3,068,488	)		(2,768,205	)		(8,737,743	)		(9,492,366	)
	$	—		$	—		$	—		$	—
Earnings (loss) before income taxes and noncontrolling interests:
Steel mills	$	310,591		$	218,367		$	819,951		$	944,598
Steel products		31,018			(10,252	)		51,167			(34,094	)
Raw materials		(493	)		14,535			13,261			44,223
Corporate/eliminations		(92,914	)		(30,875	)		(330,517	)		(321,697	)
	$	248,202		$	191,775		$	553,862		$	633,030
	Sept. 28, 2013			Dec. 31, 2012
Segment assets:
Steel mills	$	8,137,612		$	7,894,974
Steel products		2,986,752			2,935,146
Raw materials		3,746,813			3,400,690
Corporate/eliminations		220,599			(78,751	)
	$	15,091,776		$	14,152,059

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19. EARNINGS PER SHARE: The computations of basic and diluted net earnings per share are as follows (in thousands, except per share amounts):

	Three Months (13 Weeks) Ended						Nine Months (39 Weeks) Ended
	Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013			Sept. 29, 2012
Basic net earnings per share:
Basic net earnings	$	147,597		$	110,308		$	317,531		$	367,711
Earnings allocated to participating securities		(518	)		(412	)		(1,324	)		(1,242	)
Net earnings available to common stockholders	$	147,079		$	109,896		$	316,207		$	366,469
Average shares outstanding		319,341			318,463			318,979			318,042
Basic net earnings per share	$	0.46		$	0.35		$	0.99		$	1.15
Diluted net earnings per share:
Diluted net earnings	$	147,597		$	110,308		$	317,531		$	367,711
Earnings allocated to participating securities		(518	)		(412	)		(1,324	)		(1,242	)
Net earnings available to common stockholders	$	147,079		$	109,896		$	316,207		$	366,469
Diluted average shares outstanding:
Basic shares outstanding		319,341			318,463			318,979			318,042
Dilutive effect of stock options and other		185			57			153			71
		319,526			318,520			319,132			318,113
Diluted net earnings per share	$	0.46		$	0.35		$	0.99		$	1.15

The following stock options were excluded from the computation of diluted net earnings per share because their effect would have been anti-dilutive:

	Three Months (13 Weeks) Ended				Nine Months (39 Weeks) Ended
	Sept. 28, 2013		Sept. 29, 2012		Sept. 28, 2013		Sept. 29, 2012
Anti-dilutive stock options:
Weighted average shares		—		801		183		534
Weighted average exercise price	$	—	$	42.07	$	44.51	$	42.07

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Certain statements made in this quarterly report are forward-looking statements that involve risks and uncertainties. The words “believe,” “expect,” “project,” “will,” “should,” “could” and similar expressions are intended to identify those forward-looking statements. These forward-looking statements reflect the Company’s best judgment based on current information, and although we base these statements on circumstances that we believe to be reasonable when made, there can be no assurance that future events will not affect the accuracy of such forward-looking information. As such, the forward-looking statements are not guarantees of future performance, and actual results may vary materially from the projected results and expectations discussed in this report. Factors that might cause the Company’s actual results to differ materially from those anticipated in forward-looking statements include, but are not limited to: (1) the sensitivity of the results of our operations to prevailing steel prices and changes in the supply and cost of raw materials, including pig iron, iron ore and scrap steel; (2) availability and cost of electricity and natural gas which could negatively affect our cost of steel production or could result in a delay or cancellation of existing or future drilling within our natural gas working interest drilling programs; (3) market demand for steel products, which, in the case of many of our products, is driven by the level of nonresidential construction activity in the U.S.; (4) competitive pressure on sales and pricing, including pressure from imports and substitute materials; (5) impairment in the recorded value of inventory, equity investments, fixed assets, goodwill or other long-lived assets; (6) uncertainties surrounding the global economy, including the severe economic downturn in construction markets and excess world capacity for steel production; (7) fluctuations in currency conversion rates; (8) U.S. and foreign trade policy affecting steel imports or exports; (9) significant changes in laws or government regulations affecting environmental compliance, including legislation or regulations that result in greater regulation of greenhouse gas emissions that could increase our energy costs and our capital expenditures and operating costs or cause one or more of our permits to be revoked or make it more difficult to obtain permit modifications; (10) the cyclical nature of the steel industry; (11) capital investments and acquisitions and their impact on our performance; and (12) our safety performance.

The following discussion should be read in conjunction with the unaudited condensed consolidated financial statements included elsewhere in this report, as well as the audited consolidated financial statements, “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in Nucor’s Annual Report on Form 10-K for the year ended December 31, 2012.

Overview

Nucor and its affiliates manufacture steel and steel products. Nucor also produces direct reduced iron (“DRI”) for use in its steel mills. Through The David J. Joseph Company and its affiliates (“DJJ”), the Company also processes ferrous and nonferrous metals and brokers ferrous and nonferrous metals, pig iron, hot briquetted iron (“HBI”) and DRI. Most of Nucor’s operating facilities and customers are located in North America, but increasingly, Nucor is doing business outside of North America as well. Nucor’s operations include several international trading and sales companies that buy and sell steel and steel products manufactured by the Company and others. Nucor is North America’s largest recycler, using scrap steel as the primary raw material in producing steel and steel products.

Nucor reports its results in three segments: steel mills, steel products and raw materials. In the steel mills segment, Nucor produces sheet steel (hot and cold-rolled), plate steel, structural steel (wide-flange beams, beam blanks, H-piling and sheet piling) and bar steel (blooms, billets, concrete reinforcing bar, merchant bar and special bar quality). Nucor manufactures steel principally from scrap steel and scrap steel substitutes using electric arc furnaces, continuous casting and automated rolling mills. The steel mills segment also includes Nucor’s equity method investments in Duferdofin Nucor and NuMit LLC, as well as Nucor’s steel trading businesses and rebar distribution businesses that were moved into the segment in the first quarter of 2013. In the steel products segment, Nucor produces steel joists and joist girders, steel deck, fabricated concrete reinforcing steel, cold-finished steel, steel fasteners, metal building systems, steel grating and expanded metal, and wire and wire mesh. In the raw materials segment, Nucor produces DRI; brokers ferrous and nonferrous metals, pig iron, HBI and DRI; supplies ferro-alloys; and processes ferrous and nonferrous scrap metal. The raw materials segment also includes certain equity method investments and our natural gas drilling working interests.

In late June 2012, Nucor completed the acquisition of the entire equity interest in Skyline Steel LLC (“Skyline”) and its subsidiaries for the cash purchase price of approximately $675.4 million. Skyline is a steel foundation manufacturer and distributor serving the U.S., Canada, Mexico and Caribbean. Its steel products are used in marine construction, bridge and highway construction, heavy civil construction, storm protection, underground commercial parking, and environmental containment projects in the infrastructure and construction industries. Skyline is a significant consumer of H-piling and sheet piling from Nucor-Yamato Steel Company, and is a growing downstream consumer of Nucor’s coiled plate and sheet products. Skyline’s results since the acquisition date are included in the steel mills segment’s results.

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In August 2012, Nucor sold the assets of Nucor Wire Products Pennsylvania, Inc. Nucor continues to produce wire and mesh products at facilities in Utah, Connecticut and our Laurel LEC Operations in Canada.

In October 2012, a subsidiary of Nucor entered into a long-term agreement with Encana Oil & Gas (USA) Inc. (Encana) under which Nucor acquired an undivided 50% working interest in U.S.-based proven natural gas reserves. Nucor’s estimated minimum contractual investment is approximately $3.64 billion for the drilling and completion of natural gas wells over the life of the agreement that is projected to span more than 20 years. Natural gas produced by our working interest drilling programs is sold to offset exposure to the volatility of the price of natural gas we use in our steel production and DRI facilities.

Nucor acquired a 50% economic and voting interest in Hunter Ridge in November 2012. Hunter Ridge provides services for the gathering, separation and compression of energy products including natural gas produced by Nucor’s working interest drilling program. As of September 28, 2013, Nucor’s investment in Hunter Ridge was $132.9 million.

The start-up of operations on our 2,500,000-ton DRI facility in Louisiana could be delayed until the end of the year. Nucor Steel Louisiana was finishing construction of its new DRI plant and preparing to begin production when a storage dome collapsed late in the third quarter. There were no injuries sustained, and there was no environmental impact as a result of the dome collapse.

The average utilization rates of all operating facilities in the steel mills, steel products and raw materials segments were approximately 74%, 58% and 62%, respectively, in the first nine months of 2013 compared with 75%, 61% and 65%, respectively, in the first nine months of 2012.

Results of Operations

Net Sales Net sales to external customers by segment for the third quarter and first nine months of 2013 and 2012 were as follows (in thousands):

	Three Months (13 Weeks) Ended							Nine Months (26 Weeks) Ended
	September 28, 2013		September 29, 2012		% Change			September 28, 2013		September 29, 2012		% Change
Steel mills	$	3,435,884	$	3,319,518		4	%	$	9,901,471	$	10,682,810		-7	%
Steel products		964,153		1,006,366		-4	%		2,690,604		2,840,055		-5	%
Raw materials		540,899		475,322		14	%		1,565,221		1,455,134		8	%
Net sales	$	4,940,936	$	4,801,206		3	%	$	14,157,296	$	14,977,999		-5	%

Net sales for the third quarter of 2013 increased 3% over the third quarter of 2012. Average sales price per ton decreased 4% from $832 in the third quarter of 2012 to $801 in the third quarter of 2013, while total tons sold to outside customers increased 7% from the same period last year.

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Net sales for the first nine months of 2013 decreased 5% from the first nine months of 2012. Average sales price per ton decreased 6% from $850 in the first nine months of 2012 to $799 in the first nine months of 2013, while total tons sold to outside customers increased 1% over the same period last year.

In the steel mills segment, production and sales tons were as follows (in thousands):

	Three Months (13 Weeks) Ended							Nine Months (39 Weeks) Ended
	Sept. 28, 2013		Sept. 29, 2012		% Change			Sept. 28, 2013		Sept. 29, 2012		% Change
Steel production		5,202		4,819		8	%		14,912		15,139		-1	%
Outside steel shipments		4,640		4,313		8	%		13,248		13,352		-1	%
Inside steel shipments		719		730		-2	%		2,211		2,128		4	%
Total steel shipments		5,359		5,043		6	%		15,459		15,480		-

Net sales for the steel mills segment increased 4% over the third quarter of 2012 due to an 8% increase in tons sold to outside customers, partially offset by a 4% decrease in the average sales price per ton from $775 to $741. Average selling prices decreased in the third quarter of 2013 as compared to the third quarter of 2012 in all of our steel categories (sheet, bar, plate and structural) due to increased imports and excess capacity.

As compared to the second quarter of 2013, third quarter sheet steel outside shipments improved by 9% as a result of competitor supply disruptions, customer inventory restocking and some market demand improvement. Structural steel outside shipments improved by 18% over the second quarter of 2013 due to Nucor-Yamato Steel Company’s (“NYS”) higher production following its 17 day planned outage during the second quarter and customer inventory restocking. Demand in nonresidential construction markets is slowly improving but continues to lack sustained momentum. The strongest markets continue to be in manufactured goods, including energy and automotive.

The 7% decrease in sales from the first nine months of 2012 to the first nine months of 2013 in the steel mills segment was attributable to a 7% decrease in the average sales price per ton from $804 to $747, and a 1% decrease in tons sold to outside customers.

Tonnage data for the steel products segment is as follows (in thousands):

	Three Months (13 weeks) Ended							Nine Months (39 weeks) Ended
	Sept. 28, 2013		Sept. 29, 2012		% Change			Sept. 28, 2013		Sept. 29, 2012		% Change
Joist production		86		78		10	%		248		217		14	%
Deck sales		90		80		13	%		242		221		10	%
Cold finish sales		113		118		-4	%		359		388		-7	%
Fabricated concrete reinforcing steel sales		305		343		-11	%		813		915		-11	%

The 4% decrease in the steel products segment’s sales from the third quarter of 2012 was due to a 4% decrease in volume and a slight decrease in average sales price per ton from $1,371 to $1,369. The 5% decrease in the steel products segment’s sales for the first nine months of the year was due to a 5% decrease in volume and a 1% decrease in average sales price per ton from $1,384 to $1,374. Sales in the steel products segment remain depressed due to the continued weakness in the nonresidential construction market. Sales of fabricated concrete reinforcing steel decreased in the third quarter and first nine months of 2013 as compared to the third quarter and first nine months of 2012 due to an 11% decrease in volume partially offset by an increase in pricing.

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The sales for the raw materials segment increased 14% over the third quarter of 2012 and 8% over the first nine months of 2012 primarily due to increased volumes at DJJ’s recycling and brokerage businesses and at our natural gas drilling working interests. In the third quarter of 2013, approximately 82% of outside sales in the raw materials segment were from the brokerage operations of DJJ and approximately 13% of the outside sales were from the scrap processing facilities (85% and 13%, respectively, in the third quarter of 2012). In the first nine months of 2013, approximately 83% of outside sales for the raw materials segment were from the brokerage operations of DJJ and approximately 13% of outside sales were from the scrap processing facilities (85% and 13%, respectively, in the first nine months of 2012).

Gross Margins For the third quarter of 2013 , Nucor recorded gross margins of $408.5 million (8%), compared to $348.7 million (7%) in the third quarter of 2012. The gross margin was impacted by the 7% increase in tons shipped to outside customers, partially offset by the 4% decrease in average sales price per ton along with the following factors:

• In the steel mills segment, the average scrap and scrap substitute cost per ton used decreased 2% from $380 in the third quarter of 2012 to $372 in the third quarter of 2013; however, metal margin per ton also decreased. Despite the decrease in metal margin per ton, total metal margin dollars increased in the third quarter of 2013 compared to the third quarter of 2012 due to the 8% increase in shipments to outside customers in the steel mills segment. Metal margins in the third quarter of 2013 were unchanged from the second quarter of 2013. Metal margin is the difference between the selling price of steel and the cost of scrap and scrap substitutes.

Scrap prices are driven by the global supply and demand for scrap and other iron based raw materials used to make steel. Scrap prices were relatively flat throughout the third quarter of 2013. As we begin the fourth quarter, we have seen scrap prices remain consistent with the third quarter. We currently expect low volatility in scrap prices in the fourth quarter.

• Nucor’s gross margins are significantly impacted by the application of the LIFO method of accounting. LIFO charges or credits for interim periods are based on management’s current estimates of both inventory costs and quantities at year-end. The actual amounts will likely differ from these estimated amounts, and such differences may be significant. Annual charges or credits are largely based on the relative changes in cost and quantities year over year, primarily within raw material inventory in the steel mills segment. Gross margins were impacted by a LIFO credit of $18.0 million in the third quarter of 2013, compared with a credit of $84.0 million in the third quarter of 2012.

• Nucor’s gross margins were negatively impacted in the third quarter of 2012 by $28.2 million in inventory related purchase accounting adjustments associated with the acquisition of Skyline.

• Energy costs decreased approximately $3 per ton from the third quarter of 2012 due mainly to lower natural gas unit costs and higher production volumes.

• Gross margins at our rebar fabrication businesses increased significantly in the third quarter of 2013 as compared to the third quarter of 2012 due to higher average sales prices and the effects of management initiatives that have resulted in lower costs, better selling strategies and improved supplier relationships.

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For the first nine months of 2013, Nucor recorded gross margins of $1.02 billion (7%), compared to $1.13 billion (8%) in the first nine months of 2012. The gross margin was impacted by the following factors:

• In the steel mills segment, the average scrap and scrap substitute cost per ton used decreased 10% from $418 in the first nine months of 2012 to $376 in the first nine months of 2013; however, metal margins also decreased as a result of the 6% decrease in average sales price per ton.

• Nucor’s gross margins in the first nine months of 2012 were negatively impacted by $36.8 million of inventory related purchase accounting adjustments associated with our acquisition of Skyline.

• Gross margin was affected by a LIFO credit of $84.0 million in the first nine months of 2012. There was no LIFO charge or credit recorded in the first nine months of 2013.

• Gross margins at our rebar fabrication businesses increased significantly in the first nine months of 2013 as compared to the first nine months of 2012 due to the reasons described above.

• Gross margins related to DJJ’s scrap processing operations decreased significantly during the first nine months of 2013 compared to the first nine months of 2012 due to the continued difficult conditions in the scrap processing industry. Gross margins at DJJ’s scrap processing facilities were also impacted by excess shredding capacity and weather-related effects in the first quarter of 2013 that reduced the flow of scrap into our scrap processing operations.

Marketing, Administrative and Other Expenses The major component of marketing, administrative and other expenses is profit sharing and other incentive compensation costs. These costs, which are based upon and fluctuate with Nucor’s financial performance, increased $10.3 million in the third quarter of 2013 compared to the third quarter of 2012, and decreased $6.2 million in the first nine months of 2013 compared to the first nine months of 2012. Profit sharing and other incentive compensation costs decreased $3.5 million in the third quarter of 2013 compared to the second quarter of 2013 due to the annual restricted stock unit grant and the stock option grant that occurred in the second quarter of 2013.

The increase in marketing, administrative and other expenses in the first nine months of 2013 as compared to the same period in the prior year is due primarily to the inclusion of Skyline’s results for the entire first nine months of 2013 as compared to only being included after its June 2012 acquisition date during the first nine months of 2012.

In the third quarter of 2013, a storage dome collapsed at Nucor Steel Louisiana in St. James Parish. As a result, Nucor recorded a partial write down of assets at the facility, including $7.0 million of inventory and $21.0 million of property, plant and equipment, offset by a $14.0 million insurance receivable that was based on management’s estimate of probable insurance recoveries. The net $14.0 million charge on the Nucor Steel Louisiana assets is included in marketing, administrative and other expenses in the condensed consolidated statement of earnings. In the third quarter of 2012, Nucor sold the assets of Nucor Wire Products Pennsylvania, Inc. The resulting loss of $17.6 million is also recorded in marketing, administrative and other expenses.

Equity in (Earnings) Losses of Unconsolidated Affiliates Equity method investment earnings, including amortization expense and other purchase accounting adjustments were $2.3 million and a loss of $2.3 million in the third quarter of 2013 and 2012, respectively, and were earnings of $2.7 million and a loss of $9.1 million in the first nine months of 2013 and 2012, respectively. The increase in the equity method investment earnings is primarily due to a decrease in losses at Duferdofin Nucor, higher equity method earnings at NuMit, and earnings at Hunter Ridge during the first nine months of 2013 (none in the first nine months of 2012).

Impairment of Non-current Assets Nucor incurred a $30.0 million impairment charge in the second quarter of 2012 (none in the third quarter and first nine months of 2013). The entire 2012 charge related to the impairment of Nucor’s investment in Duferdofin Nucor.

In the fourth quarter of 2012, Nucor assessed its equity investment in Duferdofin Nucor for impairment. After completing its assessment, the Company determined that the estimated fair value exceeded its carrying amount and that there was no need for further impairment. There has been no

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significant deterioration in near-term financial projections or any other key assumptions since the most recent impairment analysis was performed. However, steel market conditions in Europe have continued to be challenging through the first nine months of 2013, and, therefore, it is reasonably possible that material deviation of future performance compared to the estimates used in our most recent valuation could result in further impairment of our investment in Duferdofin Nucor that could have a material effect on our results.

Interest Expense (Income) Net interest expense for the third quarter and first nine months of 2013 and 2012 was as follows (in thousands):

	Three Months (13 Weeks) Ended						Nine Months (39 Weeks) Ended
	Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013			Sept. 29, 2012
Interest expense	$	38,621		$	42,954		$	112,978		$	132,254
Interest income		(1,154	)		(2,649	)		(3,792	)		(9,226	)
Interest expense, net	$	37,467		$	40,305		$	109,186		$	123,028

In the third quarter of 2013 gross interest expense decreased 10% from the third quarter of 2012 due to a decrease in average debt outstanding and a decrease in the average interest rate on our debt. Gross interest income decreased due to a decrease in the average interest rate earned on investments combined with decreased average investments.

In the first nine months of 2013, gross interest expense decreased 15% from the first nine months of 2012 due mainly to a decrease in average debt outstanding and a decrease in the average interest rate. Gross interest income decreased due to a decrease in the average interest rate earned on investments combined with decreased average investments.

Earnings Before Income Taxes and Noncontrolling Interests Earnings before income taxes and noncontrolling interests by segment for the third quarter and first nine months of 2013 and 2012 were as follows (in thousands):

	Three Months (13 Weeks) Ended						Nine Months (39 Weeks) Ended
	Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013			Sept. 29, 2012
Steel mills	$	310,591		$	218,367		$	819,951		$	944,598
Steel products		31,018			(10,252	)		51,167			(34,094	)
Raw materials		(493	)		14,535			13,261			44,223
Corporate/eliminations		(92,914	)		(30,875	)		(330,517	)		(321,697	)
	$	248,202		$	191,775		$	553,862		$	633,030

Earnings before income taxes and noncontrolling interests in the steel mills segment for the third quarter of 2013 increased significantly from the third quarter of 2012 due primarily to the higher volume, higher total metal margin dollars and lower per unit energy costs caused by increased production volume. Earnings before income taxes and noncontrolling interests in the steel mills segment in the third quarter of 2013 improved significantly compared with the second quarter of 2013 mainly due to better pricing and volume for sheet steel and increased profitability in structural steel due to NYS’s higher outside sales tons following a planned 17 day outage in the second quarter. Earnings before income taxes and noncontrolling interests for the first nine months of 2013 decreased from the first nine months of 2012 due to lower sales prices, lower shipments to external customers, lower metal margins and the $84.0 million LIFO credit in 2012 (none in 2013). Partially offsetting those factors were decreased profit sharing and other incentive compensation costs in the first nine months of 2013, and both the $36.8 million of purchase accounting adjustments related to the Skyline acquisition and the $30.0 million impairment charge related to Duferdofin Nucor that were recorded in the first nine months of 2012. Although conditions are slowly improving from historically low levels, the nonresidential construction market continues to lack sustained momentum. The strongest end markets continue to be in manufactured goods, including energy and automotive.

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Earnings before income taxes and noncontrolling interests in the steel products segment increased in the third quarter and first nine months of 2013 as compared to the third quarter and first nine months of 2012. The steel product’s segment loss in the third quarter and first nine months of 2012 was impacted by the $17.6 million loss on the sale of assets of Nucor Wire Products Pennsylvania Inc. Although the average sales price and volume for the segment were lower than last year’s third quarter and first nine months, profitability at our joist, deck, cold finish and rebar fabrication operations increased in the third quarter and first nine months of 2013 as compared to the respective periods in the prior year. The largest increase was in our rebar fabrication businesses, which experienced higher average sales prices and the effects of management initiatives that have resulted in lower costs, better selling strategies and improved supplier relationships. The steel products segment has had operating profits for five of the last six quarters.

The profitability of our raw materials segment decreased significantly in the third quarter and first nine months of 2013 from the third quarter and first nine months of 2012. Third quarter of 2013 earnings before income taxes and noncontrolling interests also decreased from the second quarter of 2013. The charges related to the net $14.0 million write down of inventory and property, plant and equipment as a result of the dome collapse at Nucor Steel Louisiana contributed to much of the decrease in the third quarter and first nine months of 2013 compared to the prior year, and most of the decrease between the second and third quarters of 2013. The difficult conditions in the scrap processing industry continued in the third quarter of 2013, which has had a negative impact on the profitability of the scrap processing operations of DJJ since the first quarter of 2012. During this time, excess shredding capacity has increased competition for raw materials while the selling price of scrap has decreased in the first nine months of 2013 as compared to the first nine months of 2012. An unplanned 18 day outage at our Trinidad DRI facility in the first quarter of 2013 also contributed to lower profitability for the raw materials segment in the first nine months of 2013 as compared to the first nine months of 2012.

Noncontrolling Interests Noncontrolling interests represent the income attributable to the noncontrolling partners of Nucor’s joint ventures, primarily NYS, of which Nucor owns 51%. The increase in earnings attributable to noncontrolling interests in the third quarter of 2013 as compared to the third quarter of 2012 was driven by increased sales tons at NYS partially offset by a slight decrease in metal margins. Earnings attributable to noncontrolling interests in the first nine months of 2013 increased over the first nine months of 2012 due mainly to improved metal margins partially offset by a decrease in sales tons. Under the NYS limited partnership agreement, the minimum amount of cash to be distributed each year to the partners is the amount needed by each partner to pay applicable U.S. federal and state income taxes. In the first nine months of 2012, the amount of cash distributed to noncontrolling interest holders exceeded the earnings attributable to noncontrolling interests based on mutual agreement of the general partners; however, the cumulative amount of cash distributed to partners was less than the cumulative net earnings of the partnership.

Provision for Income Taxes The effective tax rate was 28.2% in the third quarter of 2013 compared to 32.3% in the third quarter of 2012. The expected rate for the full year of 2013 will be approximately 29.3% compared with 30.5% for the full year of 2012. The decrease in the effective tax rate for the third quarter of 2013 as compared to the third quarter of 2012 is primarily due to the change in relative proportions of net earnings attributable to noncontrolling interests to total pre-tax earnings between the periods and the impact of the reversal of tax reserves due to closing of the statute of limitations in the third quarter of 2013.

We estimate that in the next twelve months our gross uncertain tax positions, exclusive of interest, could decrease by as much as $13.5 million as a result of the expiration of the statute of limitations.

Nucor has concluded U.S. federal income tax matters for years through 2009. The 2010 to 2012 tax years are open to examination by the Internal Revenue Service. The tax years 2010 through 2012 remain open to examination by other major taxing jurisdictions to which Nucor is subject (primarily Canada and other state and local jurisdictions).

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Net Earnings Attributable to Nucor Stockholders and Return on Equity Nucor reported consolidated net earnings of $147.6 million, or $0.46 per diluted share, in the third quarter of 2013 compared to consolidated net earnings of $110.3 million, or $0.35 per diluted share, in the third quarter of 2012. Net earnings attributable to Nucor stockholders as a percentage of net sales were 3% and 2% in the third quarters of 2013 and 2012, respectively.

Nucor reported consolidated net earnings of $317.5 million, or $0.99 per diluted share, in the first nine months of 2013, compared to consolidated net earnings of $367.7 million, or $1.15 per diluted share, in the first nine months of 2012. Net earnings attributable to Nucor stockholders as a percentage of net sales were 2% in the first nine months of 2013 and the first nine months of 2012. Return on average stockholders’ equity was approximately 6% in the first nine months of both 2013 and 2012.

Outlook Although we expect stability in metal margins, we typically experience lower shipping volumes in the fourth quarter due to seasonal factors. Additionally, we expect extended planned outages during the fourth quarter at our SBQ mill in Norfolk, Nebraska, our sheet mill in Berkeley County, South Carolina, and our structural mill in Blytheville, Arkansas in preparation for our previously announced capital expansion projects at those facilities. As a result, we currently expect to see moderately lower earnings for the fourth quarter of 2013.

Nucor’s largest exposure to market risk is via our steel mills and steel products segments. Our largest single customer in the first nine months of 2013 represented approximately 5% of sales and consistently pays within terms. In the raw materials segment, we are exposed to price fluctuations related to the purchase of scrap steel and iron ore. Our exposure to market risk is mitigated by the fact that our steel mills use a significant portion of the products of this segment.

Liquidity and capital resources

Cash provided by operating activities was $883.6 million in the first nine months of 2013, a decrease of 21% compared with cash provided by operating activities of $1.12 billion in the first nine months of 2012. Changes in operating assets and liabilities were ($28.5) million in the first nine months of 2013 compared with $186.6 million in the first nine months of 2012. The primary driver of this decrease was changes in accounts receivable and inventory. Accounts receivable and cash used to purchase inventory decreased during the first nine months of 2012 due to the decrease in average sales price per ton and in scrap prices during that period. There was a significant increase in accounts receivable and cash used to purchase inventory during the first nine months of 2013. While scrap prices have remained relatively flat during the period, there was a 5% increase in inventory tons on hand from year-end of 2012. Additionally, even though the average sales price per ton decreased from year-end of 2012, outside sales tons in the third quarter of 2013 were significantly higher than in the fourth quarter of 2012. Also affecting cash provided by operating activities was a $37.8 million decrease in earnings period over period, and the prior year also includes a $30.0 million non-cash charge for the impairment of non-current assets during the first nine months of 2012. This decrease was partially offset by a $53.4 million increase in deferred income taxes.

The current ratio was 3.2 at the end of the third quarter of 2013 and 2.8 at year-end 2012. Accounts receivable and inventories increased 12% and 5%, respectively, since year-end, while sales increased 11% from the fourth quarter of 2012. In the third quarter of 2013, total accounts receivable turned approximately every five weeks and inventories turned approximately every seven weeks. This compares to turns every five weeks for accounts receivable and every six weeks for inventory in the third quarter of 2012. Inventory turnover has worsened slightly from historical rates due mainly to the acquisition of Skyline, which as a distributor must keep a larger supply of inventory on hand. The current ratio was also impacted by a 64% increase in cash and cash equivalents due mainly to the issuance of $999.1 million (net of discounts) of debt during the quarter.

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Cash used in investing activities increased $283.0 million from the prior year period. The change is due primarily to a net decrease of $775.3 million in proceeds received from the sale of investments and restricted investments (net of purchases) and changes in restricted cash which were mainly used to fund acquisitions and capital expenditures in 2012. In addition, there was a $274.2 million increase in cash used for capital expenditures over 2012 in large part due to the construction of our DRI facility in Louisiana and the funding of our natural gas working interest drilling program. Partially offsetting the change in net proceeds from investments and capital expenditures was a decrease of $763.7 million in acquisitions. While Nucor had no acquisitions in the first nine months of 2013, our DJJ team acquired three metal recycling companies in the first quarter of 2012, and Nucor closed on the Skyline acquisition for $683.5 million in the second quarter of 2012.

Cash provided by financing activities in the first nine months of 2013 increased by $706.8 million over the first nine months of 2012. During the third quarter, we issued $500.0 million of 4.00% notes due in 2023 and $500.0 million of 5.2% notes due in 2043. The debt issuance effectively refinanced $900.0 million of debt that matured between the fourth quarter of 2012 and the second quarter of 2013. The weighted average interest rate of the new debt is 35 basis points lower than the retired debt, and the new debt also lengthens our debt maturity profile with its weighted average term to maturity of 20 years. Net of discounts, this debt issuance increased cash provided by financing activities by $999.1 million. Partially offsetting the increase due to the debt issuance was a decrease of $250.0 million for the repayment of long-term debt which occurred in the second quarter of 2013. There are currently no long-term debt maturities in the next twelve months. Additionally, over 99% of our long-term debt matures in 2017 and beyond.

Nucor’s conservative financial practices have served us well in the past and are serving us well today. Our cash and cash equivalents and short-term investments position remains robust at $1.77 billion as of September 28, 2013. Our $1.5 billion revolving credit facility is undrawn and was amended and restated during the quarter to extend the maturity date to August 2018. We believe our financial strength is a key strategic advantage among domestic steel producers, particularly during recessionary business cycles. We carry the highest credit ratings of any metals and mining company in North America, with an A rating from Standard and Poor’s and a Baa1 rating from Moody’s. Based upon these factors, we expect to continue to have adequate access to the capital markets at a reasonable cost of funds for liquidity purposes when needed. Our credit ratings are dependent, however, upon a number of factors, both qualitative and quantitative, and are subject to change at any time. The disclosure of our credit ratings is made in order to enhance investors’ understanding of our sources of liquidity and the impact of our credit ratings on our cost of funds.

Our credit facility includes only one financial covenant, which is a limit of 60% on the ratio of funded debt to total capitalization. In addition, the credit facility contains customary non-financial covenants, including a limit on Nucor’s ability to pledge the Company’s assets and a limit on consolidations, mergers and sales of assets. As of September 28, 2013, our funded debt to total capital ratio was 36%, and we were in compliance with all other covenants under our credit facility. No borrowings were outstanding under the credit facility as of September 28, 2013.

In challenging market conditions such as we are experiencing today, our financial strength allows a number of capital preservation options. Nucor’s robust capital investment and maintenance practices give us the flexibility to reduce spending by prioritizing our capital projects, potentially rescheduling certain projects, and selectively allocating capital to investments with the greatest impact on our long-term earnings power. Capital expenditures increased by 45% from $613.8 million during the first nine months of 2012 to $887.9 million in the first nine months of 2013. Capital expenditures for 2013 are projected to be approximately $1.1 billion compared to $947.6 million in 2012.

In September 2013, Nucor’s board of directors declared a quarterly cash dividend on Nucor’s common stock of $0.3675 per share payable on November 8, 2013 to stockholders of record on September 27, 2013. This dividend is Nucor’s 162^nd consecutive quarterly cash dividend.

Funds provided from operations, cash and cash equivalents, short-term investments, restricted cash and new borrowings under existing credit facilities are expected to be adequate to meet future capital expenditure and working capital requirements for existing operations for at least the next 24 months.

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Item 3. Quantitative and Qualitative Disclosures About Market Risk

In the ordinary course of business, Nucor is exposed to a variety of market risks. We continually monitor these risks and develop appropriate strategies to manage them.

Interest Rate Risk - Nucor manages interest rate risk by using a combination of variable-rate and fixed-rate debt. Nucor also occasionally makes use of interest rate swaps to manage net exposure to interest rate changes. Management does not believe that Nucor’s exposure to interest rate market risk has significantly changed since December 31, 2012.

Commodity Price Risk—In the ordinary course of business, Nucor is exposed to market risk for price fluctuations of raw materials and energy, principally scrap steel, other ferrous and nonferrous metals, alloys and natural gas. We attempt to negotiate the best prices for our raw materials and energy requirements and to obtain prices for our steel products that match market price movements in response to supply and demand. Nucor utilizes a raw material surcharge as a component of pricing steel to pass through the cost increases of scrap steel and other raw materials. In periods of stable demand for our products, our surcharge mechanism has worked effectively to reduce the normal time lag in passing through higher raw material costs so that we can maintain our gross margins. When demand for and cost of raw materials is lower, however, the surcharge benefits our sales prices to a lesser extent.

Natural gas produced by Nucor’s working interest drilling program is being sold to third parties to offset our exposure to changes in the price of gas consumed by its Louisiana DRI facility. In addition to its future natural gas needs at the new DRI facility scheduled to begin operations later this year, Nucor is also a substantial consumer of natural gas at its steel mill operations. We expect that the natural gas produced through the drilling program will be sufficient to cover Nucor’s demand at all of its steel mills in the United States plus the demand of two DRI plants or, alternatively, at three DRI plants. However, the natural gas production from the working interest drilling program currently does not completely cover the natural gas usage at our operating facilities. For the nine months ended September 28, 2013, the volume of natural gas sold from our natural gas working interest drilling program was equal to 60% of the volume of natural gas purchased for consumption in our domestic steelmaking and DRI facilities.

Our natural gas working interest drilling program is affected by changes in natural gas prices in an inverse manner to natural gas costs at our DRI and steel mill operations. As natural gas prices increase, our increased energy costs at our DRI and steel mill operations is somewhat mitigated by increased profit from sales of natural gas to third party customers from our natural gas drilling program. Likewise, as natural gas prices decrease, we experience decreased energy costs at our DRI and steel mill operations, but we also experience decreased profit from our natural gas drilling program.

The impact of low natural gas prices associated with our drilling program is limited by the existence of a drilling suspension clause. Nucor is contractually obligated to drill a minimum number of wells per year under the terms of our agreements with Encana; however, we have the right to suspend drilling of new wells at any time after January 1, 2015, if market pricing falls below a pre-established threshold.

Nucor also periodically uses derivative financial instruments to hedge a portion of our exposure to price risk related to natural gas purchases used in the production process and to hedge a portion of our scrap, aluminum and copper purchases and sales. Gains and losses from derivatives designated as hedges are deferred in accumulated other comprehensive income (loss) on the condensed consolidated balance sheets and recognized into earnings in the same period as the underlying physical transaction. At September 28, 2013, there were no amounts in accumulated other comprehensive income (loss) related to derivative instruments as all of our previously held positions have settled. Changes in the fair values of derivatives not designated as hedges are recognized in earnings each period. The following table presents the negative effect on pre-tax earnings of a hypothetical change in the fair value of derivative instruments outstanding at September 28, 2013, due to an assumed 10% and 25% change in the market price of each of the indicated commodities (in thousands):

Commodity Derivative	10% Change		25% Change
Aluminum	$	1,507	$	3,768
Copper	$	1,832	$	4,581

30

Any resulting changes in fair value would be recorded as adjustments to other comprehensive income (loss), net of tax, or recognized in net earnings, as appropriate. These hypothetical losses would be partially offset by the benefit of lower prices paid or higher prices received for the physical commodities.

Foreign Currency Risk - Nucor is exposed to foreign currency risk through its operations in Canada, Europe, Trinidad and Colombia. We periodically use derivative contracts to mitigate the risk of currency fluctuations.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures – As of the end of the period covered by this report, the Company carried out an evaluation, under the supervision and with the participation of the Company’s management, including the Company’s Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of the Company’s disclosure controls and procedures. Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the Company’s disclosure controls and procedures were effective as of the evaluation date.

Changes in Internal Control Over Financial Reporting – There were no changes in our internal control over financial reporting during the quarter ended September 28, 2013 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1. Legal Proceedings

We are from time to time a party to various lawsuits, claims, and other legal proceedings that arise in the ordinary course of business. With respect to all such lawsuits, claims and proceedings, we record reserves when it is probable a liability has been incurred and the amount of loss can be reasonably estimated. We do not believe that any of these proceedings, individually or in the aggregate, would be expected to have a material adverse effect on our results of operations, financial position or cash flows.

Item 1A. Risk Factors

There have been no material changes in Nucor’s risk factors from those included in Nucor’s Annual Report on Form 10-K for the year ended December 31, 2012.

Item 6. Exhibits

Exhibit No.	Description of Exhibit
12	Computation of Ratio of Earnings to Fixed Charges
31	Certification of Principal Executive Officer Pursuant to Rule 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.1	Certification of Principal Financial Officer Pursuant to Rule 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32	Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.1	Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101	Financial statements (unaudited) from the quarterly report on Form 10-Q of Nucor Corporation for the quarter ended September 28, 2013, filed on November 6, 2013, formatted in XBRL: (i) the Condensed Consolidated Statements of Earnings, (ii) the Condensed Consolidated Statements of Comprehensive Income, (iii) the Condensed Consolidated Balance Sheets, (iv) the Condensed Consolidated Statements of Cash Flows and (v) the Notes to Condensed Consolidated Financial Statements.

32

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, Nucor Corporation has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

NUCOR CORPORATION
By:	/s/ James D. Frias
	James D. Frias
	Chief Financial Officer, Treasurer
	and Executive Vice President

Dated: November 6, 2013

33

NUCOR CORPORATION

List of Exhibits to Form 10-Q – September 28, 2013

Exhibit No.	Description of Exhibit
12	Computation of Ratio of Earnings to Fixed Charges
31	Certification of Principal Executive Officer Pursuant to Rule 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.1	Certification of Principal Financial Officer Pursuant to Rule 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32	Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.1	Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101	Financial statements (unaudited) from the quarterly report on Form 10-Q of Nucor Corporation for the quarter ended September 28, 2013, filed on November 6, 2013, formatted in XBRL: (i) the Condensed Consolidated Statements of Earnings, (ii) the Condensed Consolidated Statements of Comprehensive Income, (iii) the Condensed Consolidated Balance Sheets, (iv) the Condensed Consolidated Statements of Cash Flows and (v) the Notes to Condensed Consolidated Financial Statements.

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EX-12

Exhibit 12

Nucor Corporation

2013 Form 10-Q

	Computation of Ratio of Earnings to Fixed Charges
																Nine Months			Nine Months
	Year-ended December 31,															Ended			Ended
																September 28,			September 29,
	2008			2009			2010			2011			2012			2013			2012
	(In thousands, except ratios)
Earnings
Earnings/(loss) before income taxes and noncontrolling interests	$	3,104,391		$	(413,978	)	$	267,115		$	1,251,812		$	852,940		$	553,862		$	633,030
Plus: (earnings)/losses from equity investments		36,920			82,341			32,082			10,043			13,323			(2,665	)		9,093
Plus: fixed charges (includes interest expense and amortization of bond issuance costs and settled swaps and estimated interest on rent expense)		146,360			168,317			163,626			183,541			179,169			118,302			140,442
Plus: amortization of capitalized interest		300			962			2,332			2,724			2,550			2,135			2,483
Plus: distributed income of equity investees		20,117			7,373			4,923			3,883			9,946			7,708			3,884
Less: interest capitalized		(10,020	)		(16,390	)		(940	)		(3,509	)		(4,715	)		(4,510	)		(7,393	)
Less: pre-tax earnings in noncontrolling interests in subsidiaries that have not incurred fixed charges		(314,277	)		(57,865	)		(73,110	)		(83,591	)		(88,507	)		(77,582	)		(65,160	)
Total earnings/(loss) before fixed charges	$	2,983,791		$	(229,240	)	$	396,028		$	1,364,903		$	964,706		$	597,250		$	716,379
Fixed charges
Interest cost and amortization of bond issuance and settled swaps	$	144,845		$	166,313		$	162,213		$	182,321		$	178,218		$	117,487		$	139,647
Estimated interest on rent expense		1,515			2,004			1,413			1,220			951			815			795
Total fixed charges	$	146,360		$	168,317		$	163,626		$	183,541		$	179,169		$	118,302		$	140,442
Ratio of earnings to fixed charges		20.39			*			2.42			7.44			5.38			5.05			5.10

* Earnings for the year ended December 31, 2009 were inadequate to cover fixed charges. The coverage deficiency was $397,557.

EX-31

Exhibit 31

Certification of Principal Executive Officer

Pursuant to Rule 13a-14(a)/15d-14(a)

(Section 302 of the Sarbanes-Oxley Act of 2002)

I, John J. Ferriola, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Nucor Corporation;

2. Based on my knowledge, this quarterly report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this quarterly report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting, and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent function):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 6, 2013	/s/ John J. Ferriola
	John J. Ferriola
	Chief Executive Officer and President

EX-31.1

Exhibit 31.1

Certification of Principal Financial Officer

Pursuant to Rule 13a-14(a)/15d-14(a)

(Section 302 of the Sarbanes-Oxley Act of 2002)

I, James D. Frias, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Nucor Corporation;

2. Based on my knowledge, this quarterly report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this quarterly report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this quarterly report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting, and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent function):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 6, 2013	/s/ James D. Frias
	James D. Frias
	Chief Financial Officer, Treasurer and Executive Vice President

EX-32

Exhibit 32

Certification of Principal Executive Officer

Pursuant to 18 U.S.C. 1350

(Section 906 of the Sarbanes-Oxley Act of 2002)

I, John J. Ferriola, Chief Executive Officer and President (principal executive officer) of Nucor Corporation (the “Registrant”), certify, to my knowledge, based upon a review of the Quarterly Report on Form 10-Q for the period ended September 28, 2013 of the Registrant (the “Report”), that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

/s/ John J. Ferriola

Name: John J. Ferriola

Date: November 6, 2013

EX-32.1

Exhibit 32.1

Certification of Principal Financial Officer

Pursuant to 18 U.S.C. 1350

(Section 906 of the Sarbanes-Oxley Act of 2002)

I, James D. Frias, Chief Financial Officer, Treasurer and Executive Vice President (principal financial officer) of Nucor Corporation (the “Registrant”), certify, to my knowledge, based upon a review of the Quarterly Report on Form 10-Q for the period ended September 28, 2013 of the Registrant (the “Report”), that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

/s/ James D. Frias

Name: James D. Frias

Date: November 6, 2013

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Debt

9 Months Ended

Sep. 28, 2013

Debt

11. DEBT – On July 29, 2013, Nucor issued $500.0 million of 4.00% notes due in 2023 and $500.0 million of 5.20% notes due in 2043. Net proceeds of the issuances were $991.5 million. Costs of $8.5 million associated with the issuances have been capitalized and are amortized over the life of the notes.

During the third quarter of 2013, Nucor amended its $1.50 billion unsecured revolving credit facility. The maturity date was extended from December 2016 to August 2018. Costs of $0.6 million associated with the amendment have been capitalized and are amortized over the life of the extension.

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Employee Benefit Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Employee Benefit Plans [Line Items]
Profit Sharing and Retirement Savings Plan, plan expense	$ 22.5	$ 17.5	$ 49.2	$ 58.1

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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Net unrealized loss on hedging derivatives, net of income taxes	$ 0	$ 0	$ 0	$ 1,100
Reclassification adjustment for loss on settlement of hedging derivatives included in net income, net of income taxes	0	6,200	0	18,800
Foreign currency translation gain (loss), net of income taxes	$ 500	$ 0	$ 300	$ 0

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Restricted Cash and Investments

9 Months Ended

Sep. 28, 2013

Restricted Cash and Investments

4.

RESTRICTED CASH AND INVESTMENTS: As of September 28, 2013, restricted cash consisted of net proceeds from $600.0 million 30-year variable rate Gulf Opportunity Zone bonds issued in November 2010. The restricted cash is held in a trust account and is to be used to fund part of the capital costs associated with the construction of Nucor’s direct reduced iron making facility in St. James Parish, Louisiana. Funds are disbursed as qualified expenditures for the construction of the facility are made ($274.9 million and $172.6 million in the first nine months of 2013 and 2012, respectively). There were no restricted investments held as of September 28, 2013 ($149.8 million at December 31, 2012). Since the restricted cash must be used for the construction of the facility, the entire balance has been classified as a non-current asset.

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Segments

9 Months Ended

Sep. 28, 2013

Segments

18. SEGMENTS: Nucor reports its results in the following segments: steel mills, steel products and raw materials. The steel mills segment includes carbon and alloy steel in sheet, bars, structural and plate; steel trading businesses; rebar distribution businesses; and Nucor’s equity method investments in Duferdofin Nucor and NuMit. The steel products segment includes steel joists and joist girders, steel deck, fabricated concrete reinforcing steel, cold finished steel, steel fasteners, metal building systems, steel grating and expanded metal, and wire and wire mesh. The raw materials segment includes DJJ, a scrap broker and processor; Nu-Iron Unlimited, a facility that produces DRI used by the steel mills; a DRI facility under construction in Louisiana; our natural gas working interests; and Nucor’s equity method investment in Hunter Ridge. Previously Nucor’s steel trading businesses and rebar distribution businesses were reported in an “All other” category. Beginning in the first quarter of 2013, these businesses were reclassified to the steel mills segment as part of a realignment of Nucor’s reportable segments to better reflect the way in which they are managed. The segment data for the comparable period has also been reclassified into the steel mills segment in order to conform to the current year presentation. The steel mills, steel products and raw materials segments are consistent with the way Nucor manages its business, which is primarily based upon the similarity of the types of products produced and sold by each segment. Additionally, the composition of assets by segment at December 31, 2012 was reclassified during the third quarter of 2013 to conform with the current quarter presentation. This reclassification between segments did not have any impact on the consolidated asset balances.

Net interest expense, other income, profit sharing expense, stock-based compensation and changes in the LIFO reserve are shown under Corporate/eliminations. Corporate assets primarily include cash and cash equivalents, short-term investments, restricted cash and investments, allowances to eliminate intercompany profit in inventory, fair value of natural gas hedges, deferred income tax assets, federal and state income taxes receivable, the LIFO reserve and investments in and advances to affiliates.

Nucor’s results by segment were as follows (in thousands):

	Three Months (13 Weeks) Ended						Nine Months (39 Weeks) Ended
	Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013			Sept. 29, 2012
Net sales to external customers:
Steel mills	$	3,435,884		$	3,319,518		$	9,901,471		$	10,682,810
Steel products		964,153			1,006,366			2,690,604			2,840,055
Raw materials		540,899			475,322			1,565,221			1,455,134
	$	4,940,936		$	4,801,206		$	14,157,296		$	14,977,999
Intercompany sales:
Steel mills	$	652,077		$	670,876		$	1,924,222		$	1,997,879
Steel products		24,909			17,179			75,036			52,958
Raw materials		2,391,502			2,080,150			6,738,485			7,441,529
Corporate/eliminations		(3,068,488	)		(2,768,205	)		(8,737,743	)		(9,492,366	)
	$	—		$	—		$	—		$	—
Earnings (loss) before income taxes and noncontrolling interests:
Steel mills	$	310,591		$	218,367		$	819,951		$	944,598
Steel products		31,018			(10,252	)		51,167			(34,094	)
Raw materials		(493	)		14,535			13,261			44,223
Corporate/eliminations		(92,914	)		(30,875	)		(330,517	)		(321,697	)
	$	248,202		$	191,775		$	553,862		$	633,030
	Sept. 28, 2013			Dec. 31, 2012
Segment assets:
Steel mills	$	8,137,612		$	7,894,974
Steel products		2,986,752			2,935,146
Raw materials		3,746,813			3,400,690
Corporate/eliminations		220,599			(78,751	)
	$	15,091,776		$	14,152,059

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Stockholders' Equity - Additional Information (Detail) (Nucor-Yamato Steel Company [Member])	Sep. 28, 2013	Sep. 29, 2012
Nucor-Yamato Steel Company [Member]
Stockholders' Equity [Line Items]
Noncontrolling interest, ownership percentage by parent	51.00%	51.00%

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Stock-Based Compensation

9 Months Ended

Sep. 28, 2013

Stock-Based Compensation

12. STOCK-BASED COMPENSATION: Stock Options – Stock options may be granted to Nucor’s key employees, officers and non-employee directors with exercise prices at 100% of the market value on the date of the grant. The stock options granted from 2010 through 2013 are exercisable at the end of three years and have a term of 10 years. All stock options granted prior to 2010 were fully exercised as of September 28, 2013. New shares are issued upon exercise of stock options.

A summary of activity under Nucor’s stock option plans for the first nine months of 2013 is as follows (in thousands, except year and per share amounts):

	Shares		Weighted - Average Exercise Price		Weighted - Average Remaining Contractual Life		Aggregate Intrinsic Value
Number of shares under option:
Outstanding at beginning of year		1,543	$	39.03
Granted		546	$	44.51
Exercised		—		—
Canceled		—		—
Outstanding at September 28, 2013		2,089	$	40.47		8.4 years	$	17,409
Options exercisable at September 28, 2013		242	$	41.43		6.7 years	$	1,783

All expense related to options had been recognized as of the end of the second quarter of 2013. Compensation expense for stock options was $0.3 million in the third quarter of 2012, and $8.6 million and $9.5 million in the first nine months of 2013 and 2012, respectively.

Restricted Stock Units – Nucor annually grants restricted stock units (“RSUs”) to key employees, officers and non-employee directors. The RSUs typically vest and are converted to common stock in three equal installments on each of the first three anniversaries of the grant date. A portion of the RSUs awarded to senior officers vest upon the officer’s retirement. Retirement, for purposes of vesting in these RSUs only, means termination of employment with approval of the Compensation and Executive Development Committee of the Board of Directors after satisfying age and years of service requirements. RSUs granted to non-employee directors are fully vested on the grant date and are payable to the non-employee director in the form of common stock after the termination of the director’s service on the board of directors.

RSUs granted to employees who are eligible for retirement on the date of grant are expensed immediately, and RSUs granted to employees who will become retirement-eligible prior to the end of the vesting term are expensed over the period through which the employee will become retirement-eligible since these awards vest upon retirement from the Company. Compensation expense for RSUs granted to employees who are not retirement-eligible is recognized on a straight-line basis over the vesting period.

Cash dividend equivalents are paid to participants each quarter. Dividend equivalents paid on units expected to vest are recognized as a reduction in retained earnings.

The fair value of the RSUs is determined based on the closing stock price of Nucor’s common stock on the day before the grant. A summary of Nucor’s RSU activity for the first nine months of 2013 is as follows (shares in thousands):

	Shares			Grant Date Fair Value
Restricted stock units:
Unvested at beginning of year		1,106		$	40.80
Granted		789		$	44.51
Vested		(753	)	$	42.17
Canceled		(11	)	$	39.08
Unvested at September 28, 2013		1,131		$	42.49
Shares reserved for future grants (stock options and RSUs)		10,499

Compensation expense for RSUs was $5.3 million and $4.7 million in the third quarter of 2013 and 2012, respectively, and $27.5 million and $29.6 million in the first nine months of 2013 and 2012, respectively. As of September 28, 2013, unrecognized compensation expense related to unvested RSUs was $34.2 million, which is expected to be recognized over a weighted-average period of 2.3 years.

Restricted Stock Awards – Nucor’s Senior Officers Long-Term Incentive Plan (the “LTIP”) and Annual Incentive Plan (the “AIP”) authorize the award of shares of common stock to officers subject to certain conditions and restrictions.

The LTIP provides for the award of shares of restricted common stock at the end of each LTIP performance measurement period at no cost to officers if certain financial performance goals are met during the period. One-third of the LTIP restricted stock award vests upon each of the first three anniversaries of the award date or, if earlier, upon the officer’s attainment of age fifty-five while employed by Nucor. Although participants are entitled to cash dividends and may vote such awarded shares, the sale or transfer of such shares is limited during the restricted period.

The AIP provides for the payment of annual cash incentive awards. An AIP participant may elect, however, to defer payment of up to one-half of an annual incentive award. In such event, the deferred AIP award is converted into common stock units and credited with a deferral incentive, in the form of additional common stock units, equal to 25% of the number of common stock units attributable to the deferred AIP award. Common stock units attributable to deferred AIP awards are fully vested. Common stock units credited as a deferral incentive vest upon the AIP participant’s attainment of age fifty-five while employed by Nucor. Vested common stock units are paid to AIP participants in the form of shares of common stock following their termination of employment with Nucor.

A summary of Nucor’s restricted stock activity under the AIP and LTIP for the first nine months of 2013 is as follows (shares in thousands):

	Shares			Grant Date Fair Value
Restricted stock awards and units:
Unvested at beginning of year		72		$	43.72
Granted		122		$	47.36
Vested		(121	)	$	46.32
Canceled		—			—
Unvested at September 28, 2013		73		$	45.49
Shares reserved for future grants		1,238

Compensation expense for common stock and common stock units awarded under the AIP and LTIP is recorded over the performance measurement and vesting periods based on the anticipated number and market value of shares of common stock and common stock units to be awarded. Compensation expense for anticipated awards based upon Nucor’s financial performance, exclusive of amounts payable in cash, was $1.2 million and $0.5 million in the third quarter of 2013 and 2012, respectively, and $4.5 million and $3.6 million in the first nine months of 2013 and 2012, respectively. At September 28, 2013, unrecognized compensation expense related to unvested restricted stock awards was $0.9 million, which is expected to be recognized over a weighted-average period of 1.8 years.

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Debt - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	9 Months Ended				9 Months Ended
	Jul. 29, 2013	Sep. 28, 2013 Revolving Credit Facility [Member]	Sep. 28, 2013 Revolving Credit Facility [Member]	Sep. 28, 2013 Revolving Credit Facility [Member] Scenario, Previously Reported [Member]	Sep. 28, 2013 4.00% Notes Due in 2023 [Member]	Jul. 29, 2013 4.00% Notes Due in 2023 [Member]	Sep. 28, 2013 5.20% Notes Due in 2043 [Member]	Jul. 29, 2013 5.20% Notes Due in 2043 [Member]
Debt Instrument [Line Items]
Notes issued						$ 500,000,000		$ 500,000,000
Notes interest rate						4.00%		5.20%
Net proceeds of issuance of notes	991,500,000
Notes issuance cost	8,500,000
Unsecured revolving credit facility		1,500,000,000	1,500,000,000
Cost in amendment of Revolving Credit Facility		$ 600,000
Notes Maturity Date					2023		2043
Unsecured revolving credit facility, Expiration date			2018-08	2016-12

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Stockholders' Equity - Schedule of Changes in Stockholders' Equity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Stockholders' Equity [Line Items]
Stockholders' equity, beginning of period			$ 7,885,374	$ 7,706,580
Total comprehensive income	209,994	201,557	360,897	522,298
Stock options			8,575	20,052
Issuance of stock under award plans, net of forfeitures			24,568	31,292
Amortization of unearned compensation			601	600
Dividends declared			(353,424)	(350,041)
Distributions to noncontrolling interests			(63,318)	(66,562)
Other				(645)
Stockholders' equity, end of period	7,863,273	7,863,574	7,863,273	7,863,574
Attributable to Nucor Corporation [Member]
Stockholders' Equity [Line Items]
Stockholders' equity, beginning of period			7,641,571	7,474,885
Total comprehensive income			283,315	457,201
Stock options			8,575	20,052
Issuance of stock under award plans, net of forfeitures			24,568	31,292
Amortization of unearned compensation			601	600
Dividends declared			(353,424)	(350,041)
Distributions to noncontrolling interests
Other				(645)
Stockholders' equity, end of period	7,605,206	7,633,344	7,605,206	7,633,344
Attributable to Noncontrolling Interests [Member]
Stockholders' Equity [Line Items]
Stockholders' equity, beginning of period			243,803	231,695
Total comprehensive income			77,582	65,097
Stock options
Issuance of stock under award plans, net of forfeitures
Amortization of unearned compensation
Dividends declared
Distributions to noncontrolling interests			(63,318)	(66,562)
Other
Stockholders' equity, end of period	$ 258,067	$ 230,230	$ 258,067	$ 230,230

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Goodwill and Other Intangible Assets - Schedule of Change in Net Carrying Amount of Goodwill by Segment (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013
Goodwill [Line Items]
Balance, beginning of period	$ 2,004,538
Acquisitions
Translation	(16,059)
Other	(4,862)
Balance, end of period	1,983,617
Steel Mills [Member]
Goodwill [Line Items]
Balance, beginning of period	407,045
Acquisitions
Reclassifications	88,852
Balance, end of period	495,897
Steel Products [Member]
Goodwill [Line Items]
Balance, beginning of period	805,416
Acquisitions
Translation	(16,059)
Other	(4,862)
Balance, end of period	784,495
Raw Materials [Member]
Goodwill [Line Items]
Balance, beginning of period	703,225
Acquisitions
Balance, end of period	703,225
All Other [Member]
Goodwill [Line Items]
Balance, beginning of period	88,852
Acquisitions
Reclassifications	$ (88,852)

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Derivatives (Tables)

9 Months Ended

Sep. 28, 2013

Fair Values of Derivative Instruments

The following tables summarize information regarding Nucor’s derivative instruments (in thousands):

Fair Value of Derivative Instruments

		Fair Value at
	Balance Sheet Location	Sept. 28, 2013			Dec. 31, 2012
Liability derivatives not designated as hedging instruments:
Commodity contracts	Accrued expenses and other current liabilities	$	(453	)	$	(303	)
Foreign exchange contracts	Accrued expenses and other current liabilities		(34	)		(15	)
Total liability derivatives		$	(487	)	$	(318	)

Designated as Hedging Instrument [Member]

Effect of Derivative Instruments on Condensed Consolidated Statements of Earnings

The Effect of Derivative Instruments on the Condensed Consolidated Statements of Earnings

Derivatives Designated as Hedging Instruments

			Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)				Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)					Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion)
Derivatives in Cash Flow Hedging Relationships
	Statement of  Earnings Location		Three Months (13 weeks) Ended				Three Months (13 weeks) Ended					Three Months (13 weeks) Ended
			Sept. 28, 2013		Sept. 29, 2012		Sept. 28, 2013		Sept. 29, 2012			Sept. 28, 2013		Sept. 29, 2012
Commodity contracts		Cost of products sold	$	—	$	—	$	—	$	(10,554	)	$	—	$	—

			Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)					Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)					Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion)
Derivatives in Cash Flow Hedging Relationships
	Statement of  Earnings Location		Nine Months (39 weeks) Ended					Nine Months (39 weeks) Ended					Nine Months (39 weeks) Ended
			Sept. 28, 2013		Sept. 29, 2012			Sept. 28, 2013		Sept. 29, 2012			Sept. 28, 2013		Sept. 29, 2012
Commodity contracts		Cost of products sold	$	—	$	(2,264	)	$	—	$	(31,961	)	$	—	$	500

Not Designated as Hedging Instrument [Member]

Effect of Derivative Instruments on Condensed Consolidated Statements of Earnings

Derivatives Not Designated as Hedging Instruments

			Amount of Gain or (Loss) Recognized in Earnings on  Derivatives
			Three Months (13 weeks) Ended						Nine Months (39 weeks) Ended
Derivatives Not Designated as Hedging Instruments	Statement of Earnings Location		Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013		Sept. 29, 2012
Commodity contracts		Cost of products sold	$	(789	)	$	(1,454	)	$	4,193	$	(231	)
Foreign exchange contracts		Cost of products sold		134			(25	)		253		146
Total			$	(655	)	$	(1,479	)	$	4,446	$	(85	)

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Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 28, 2013

Schedule of Change in Net Carrying Amount of Goodwill by Segment

The change in the net carrying amount of goodwill for the nine months ended September 28, 2013 by segment is as follows (in thousands):

	Steel Mills		Steel Products			Raw Materials		All Other			Total
Balance at December 31, 2012	$	407,045	$	805,416		$	703,225	$	88,852		$	2,004,538
Acquisitions		—		—			—		—			—
Reclassifications		88,852		—			—		(88,852	)		—
Translation		—		(16,059	)		—		—			(16,059	)
Other		—		(4,862	)		—		—			(4,862	)
Balance at September 28, 2013	$	495,897	$	784,495		$	703,225	$	—		$	1,983,617

Schedule of Intangible Assets

Intangible assets with estimated useful lives of three to 22 years are amortized on a straight-line or accelerated basis and were comprised of the following (in thousands):

	Sept. 28, 2013				Dec. 31, 2012
	Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
Customer relationships	$	1,151,156	$	375,128	$	1,156,979	$	325,819
Trademarks and trade names		151,909		38,513		152,869		32,653
Other		21,869		14,886		28,610		20,746
	$	1,324,934	$	428,527	$	1,338,458	$	379,218

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Fair Value Measurements - Additional Information (Detail) (USD $) In Billions, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of short-term and long-term debt, including current maturities	$ 4.62	$ 4.24

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Earnings Per Share (Tables)

9 Months Ended

Sep. 28, 2013

Computations of Basic and Diluted Net Earnings Per Share

The computations of basic and diluted net earnings per share are as follows (in thousands, except per share amounts):

	Three Months (13 Weeks) Ended						Nine Months (39 Weeks) Ended
	Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013			Sept. 29, 2012
Basic net earnings per share:
Basic net earnings	$	147,597		$	110,308		$	317,531		$	367,711
Earnings allocated to participating securities		(518	)		(412	)		(1,324	)		(1,242	)
Net earnings available to common stockholders	$	147,079		$	109,896		$	316,207		$	366,469
Average shares outstanding		319,341			318,463			318,979			318,042
Basic net earnings per share	$	0.46		$	0.35		$	0.99		$	1.15
Diluted net earnings per share:
Diluted net earnings	$	147,597		$	110,308		$	317,531		$	367,711
Earnings allocated to participating securities		(518	)		(412	)		(1,324	)		(1,242	)
Net earnings available to common stockholders	$	147,079		$	109,896		$	316,207		$	366,469
Diluted average shares outstanding:
Basic shares outstanding		319,341			318,463			318,979			318,042
Dilutive effect of stock options and other		185			57			153			71
		319,526			318,520			319,132			318,113
Diluted net earnings per share	$	0.46		$	0.35		$	0.99		$	1.15

Anti-Dilutive Stock Options

The following stock options were excluded from the computation of diluted net earnings per share because their effect would have been anti-dilutive:

	Three Months (13 Weeks) Ended				Nine Months (39 Weeks) Ended
	Sept. 28, 2013		Sept. 29, 2012		Sept. 28, 2013		Sept. 29, 2012
Anti-dilutive stock options:
Weighted average shares		—		801		183		534
Weighted average exercise price	$	—	$	42.07	$	44.51	$	42.07

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Goodwill and Other Intangible Assets - Schedule of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	$ 1,324,934	$ 1,338,458
Intangible assets, Accumulated Amortization	428,527	379,218
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	1,151,156	1,156,979
Intangible assets, Accumulated Amortization	375,128	325,819
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	151,909	152,869
Intangible assets, Accumulated Amortization	38,513	32,653
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross Amount	21,869	28,610
Intangible assets, Accumulated Amortization	$ 14,886	$ 20,746

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Stock-Based Compensation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013 Installment	Sep. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercise prices as percentage of the market value on the date of the grant			100.00%
Compensation expenses for stock options		$ 0.3	$ 8.6	$ 9.5
Number of anniversaries of grant date upon which restricted stock units vest			3
Eligible age of officer for LTIP restricted stock award			55
LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of restricted stock award vesting on anniversary			0.333
AIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount of annual incentive award payment participant can elect to defer			50.00%
Additional common stock units for election of deferred annual incentive award, percentage			25.00%
RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Installments in which restricted stock units vest and are converted to common stock			3
Compensation expense	5.3	4.7	27.5	29.6
Unrecognized compensation expense related to unvested restricted stock	34.2		34.2
Weighted-average recognition period for unrecognized compensation expense related to unvested restricted stock (years)			2 years 3 months 18 days
AIP and LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	1.2	0.5	4.5	3.6
Unrecognized compensation expense related to unvested restricted stock	$ 0.9		$ 0.9
Weighted-average recognition period for unrecognized compensation expense related to unvested restricted stock (years)			1 year 9 months 18 days
Stock Option Granted From 2010 Through 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period			3 years
Stock options term, years			10 years

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Stockholders' Equity (Tables)

9 Months Ended

Sep. 28, 2013

Schedule of Changes in Stockholders' Equity

The following tables reflect the changes in stockholders’ equity attributable to both Nucor and the noncontrolling interests of Nucor’s joint ventures, primarily Nucor-Yamato Steel Company, of which Nucor owns 51% (in thousands):

	Attributable to Nucor Corporation			Attributable to Noncontrolling Interests			Total
Stockholders’ equity at December 31, 2012	$	7,641,571		$	243,803		$	7,885,374
Total comprehensive income		283,315			77,582			360,897
Stock options		8,575			—			8,575
Issuance of stock under award plans, net of forfeitures		24,568			—			24,568
Amortization of unearned compensation		601			—			601
Dividends declared		(353,424	)		—			(353,424	)
Distributions to noncontrolling interests		—			(63,318	)		(63,318	)
Stockholders’ equity at September 28, 2013	$	7,605,206		$	258,067		$	7,863,273
	Attributable to Nucor Corporation			Attributable to Noncontrolling Interests			Total
Stockholders’ equity at December 31, 2011	$	7,474,885		$	231,695		$	7,706,580
Total comprehensive income		457,201			65,097			522,298
Stock options		20,052			—			20,052
Issuance of stock under award plans, net of forfeitures		31,292			—			31,292
Amortization of unearned compensation		600			—			600
Dividends declared		(350,041	)		—			(350,041	)
Distributions to noncontrolling interests		—			(66,562	)		(66,562	)
Other		(645	)					(645	)
Stockholders’ equity at September 29, 2012	$	7,633,344		$	230,230		$	7,863,574

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Derivatives - Fair Values of Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	$ (487)	$ (318)
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	(487)	(318)
Commodity Contract [Member] | Accrued Expenses and Other Current Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	(453)	(303)
Foreign Exchange Contract [Member] | Accrued Expenses and Other Current Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Fair Value	$ (34)	$ (15)

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Earnings Per Share

9 Months Ended

Sep. 28, 2013

Earnings Per Share

19. EARNINGS PER SHARE: The computations of basic and diluted net earnings per share are as follows (in thousands, except per share amounts):

	Three Months (13 Weeks) Ended						Nine Months (39 Weeks) Ended
	Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013			Sept. 29, 2012
Basic net earnings per share:
Basic net earnings	$	147,597		$	110,308		$	317,531		$	367,711
Earnings allocated to participating securities		(518	)		(412	)		(1,324	)		(1,242	)
Net earnings available to common stockholders	$	147,079		$	109,896		$	316,207		$	366,469
Average shares outstanding		319,341			318,463			318,979			318,042
Basic net earnings per share	$	0.46		$	0.35		$	0.99		$	1.15
Diluted net earnings per share:
Diluted net earnings	$	147,597		$	110,308		$	317,531		$	367,711
Earnings allocated to participating securities		(518	)		(412	)		(1,324	)		(1,242	)
Net earnings available to common stockholders	$	147,079		$	109,896		$	316,207		$	366,469
Diluted average shares outstanding:
Basic shares outstanding		319,341			318,463			318,979			318,042
Dilutive effect of stock options and other		185			57			153			71
		319,526			318,520			319,132			318,113
Diluted net earnings per share	$	0.46		$	0.35		$	0.99		$	1.15

The following stock options were excluded from the computation of diluted net earnings per share because their effect would have been anti-dilutive:

	Three Months (13 Weeks) Ended				Nine Months (39 Weeks) Ended
	Sept. 28, 2013		Sept. 29, 2012		Sept. 28, 2013		Sept. 29, 2012
Anti-dilutive stock options:
Weighted average shares		—		801		183		534
Weighted average exercise price	$	—	$	42.07	$	44.51	$	42.07

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Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012
Operating activities:
Net earnings	$ 395,113	$ 432,871
Adjustments:
Depreciation	390,495	394,690
Amortization	56,051	53,518
Stock-based compensation	40,551	42,858
Deferred income taxes	10,881	(42,548)
Distribution from affiliates	7,708
Equity in (earnings) losses of unconsolidated affiliates	(2,665)	9,093
Impairment of non-current assets		30,000
Loss on assets	14,000	17,563
Changes in assets and liabilities (exclusive of acquisitions and dispositions):
Accounts receivable	(204,540)	62,787
Inventories	(129,280)	41,662
Accounts payable	122,520	21,668
Federal income taxes	70,210	11,248
Salaries, wages and related accruals	12,796	(52,561)
Other	99,800	101,835
Cash provided by operating activities	883,640	1,124,684
Investing activities:
Capital expenditures	(887,929)	(613,777)
Investment in and advances to affiliates	(64,762)	(66,423)
Repayment of advances to affiliates	42,000	32,500
Disposition of plant and equipment	29,328	42,574
Acquisitions (net of cash acquired)		(763,657)
Purchases of investments	(19,349)	(409,403)
Proceeds from the sale of investments	73,428	1,341,913
Proceeds from the sale of restricted investments	148,725	209,930
Changes in restricted cash	126,045	(38,301)
Other investing	4,862
Cash used in investing activities	(547,652)	(264,644)
Financing activities:
Net change in short-term debt	8,331	28,983
Proceeds from long-term debt, net of discount	999,100
Repayment of long-term debt	(250,000)
Bond issuance costs	(7,625)
Issuance of common stock		10,515
Excess tax benefits from stock-based compensation	2,100	4,377
Distributions to noncontrolling interests	(63,318)	(66,562)
Cash dividends	(353,155)	(349,538)
Other financing activities	110	962
Cash provided by (used in) financing activities	335,543	(371,263)
Effect of exchange rate changes on cash	(1,484)	3,775
Increase in cash and cash equivalents	670,047	492,552
Cash and cash equivalents-beginning of year	1,052,862	1,200,645
Cash and cash equivalents-end of nine months	1,722,909	1,693,197
Non-cash investing activity:
Change in accrued plant and equipment purchases	$ (30,416)	$ 77,764

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Inventories

9 Months Ended

Sep. 28, 2013

Inventories

2. INVENTORIES: Inventories consisted of approximately 40% raw materials and supplies and 60% finished and semi-finished products at September 28, 2013 (37% and 63%, respectively, at December 31, 2012). Nucor’s manufacturing process consists of a continuous, vertically integrated process from which products are sold to customers at various stages throughout the process. Since most steel products can be classified as either finished or semi-finished products, these two categories of inventory are combined.

Inventories valued using the last-in, first-out (LIFO) method of accounting represented approximately 44% of total inventories as of September 28, 2013 (45% as of December 31, 2012). If the first-in, first-out (FIFO) method of accounting had been used, inventories would have been $607.2 million higher at both September 28, 2013 and December 31, 2012. Use of the lower of cost or market methodology reduced inventories by $2.7 million at September 28, 2013 ($3.5 million at December 31, 2012).

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Goodwill and Other Intangible Assets

9 Months Ended

Sep. 28, 2013

Goodwill and Other Intangible Assets

5. GOODWILL AND OTHER INTANGIBLE ASSETS: The change in the net carrying amount of goodwill for the nine months ended September 28, 2013 by segment is as follows (in thousands):

	Steel Mills		Steel Products			Raw Materials		All Other			Total
Balance at December 31, 2012	$	407,045	$	805,416		$	703,225	$	88,852		$	2,004,538
Acquisitions		—		—			—		—			—
Reclassifications		88,852		—			—		(88,852	)		—
Translation		—		(16,059	)		—		—			(16,059	)
Other		—		(4,862	)		—		—			(4,862	)
Balance at September 28, 2013	$	495,897	$	784,495		$	703,225	$	—		$	1,983,617

Previously Nucor’s steel trading businesses and rebar distribution businesses were reported in the “All other” category. Beginning in the first quarter of 2013, these businesses were reclassified to the steel mills segment as part of a realignment of Nucor’s reportable segments to better reflect the way in which they are managed.

Nucor completed its most recent annual goodwill impairment testing during the fourth quarter of 2012 and concluded that there was no impairment of goodwill for any of its reporting units. There have been no triggering events requiring an interim assessment for impairment since the most recent annual impairment testing date.

Intangible assets with estimated useful lives of three to 22 years are amortized on a straight-line or accelerated basis and were comprised of the following (in thousands):

	Sept. 28, 2013				Dec. 31, 2012
	Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
Customer relationships	$	1,151,156	$	375,128	$	1,156,979	$	325,819
Trademarks and trade names		151,909		38,513		152,869		32,653
Other		21,869		14,886		28,610		20,746
	$	1,324,934	$	428,527	$	1,338,458	$	379,218

Intangible asset amortization expense in the third quarter of 2013 and 2012 was $18.5 million and $20.4 million, respectively, and was $56.1 million and $53.5 million in the first nine months of 2013 and 2012, respectively. Annual amortization expense is estimated to be $73.9 million in 2013; $70.0 million in 2014; $68.2 million in 2015; $66.5 million in 2016; and $64.8 million in 2017.

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Property, Plant and Equipment

9 Months Ended

Sep. 28, 2013

Property, Plant and Equipment

3. PROPERTY, PLANT AND EQUIPMENT: Property, plant and equipment was recorded net of accumulated depreciation of $6.52 billion at September 28, 2013 ($6.16 billion at December 31, 2012).

In the third quarter of 2013, a storage dome collapsed at Nucor Steel Louisiana in St. James Parish. As a result, Nucor recorded a partial write down of assets at the facility, including $21.0 million of property, plant and equipment and $7.0 million of inventory, offset by a $14.0 million insurance receivable that was based on management’s estimate of probable insurance recoveries. The associated net charge of $14.0 million is included in marketing, administrative and other expenses in the condensed consolidated statement of earnings.

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Equity Investments - Additional Information (Detail)	9 Months Ended			1 Months Ended			3 Months Ended			9 Months Ended							9 Months Ended		9 Months Ended
	Sep. 28, 2013 USD ($)	Sep. 29, 2012 USD ($)	Dec. 31, 2012 USD ($)	Nov. 30, 2012 Hunter Ridge Energy Services LLC [Member]	Sep. 28, 2013 Hunter Ridge Energy Services LLC [Member] USD ($)	Dec. 31, 2012 Hunter Ridge Energy Services LLC [Member] USD ($)	Sep. 28, 2013 Duferdofin Nucor S.R.L. [Member] USD ($)	Sep. 29, 2012 Duferdofin Nucor S.R.L. [Member] USD ($)	Jun. 30, 2012 Duferdofin Nucor S.R.L. [Member] USD ($)	Sep. 28, 2013 Duferdofin Nucor S.R.L. [Member] USD ($)	Sep. 29, 2012 Duferdofin Nucor S.R.L. [Member] USD ($)	Sep. 28, 2013 Duferdofin Nucor S.R.L. [Member] EUR (€)	Dec. 31, 2012 Duferdofin Nucor S.R.L. [Member] USD ($)	Dec. 31, 2012 Duferdofin Nucor S.R.L. [Member] EUR (€)	Sep. 28, 2013 Duferdofin Nucor S.R.L. [Member] EURO [Member] EUR (€)	Dec. 31, 2012 Duferdofin Nucor S.R.L. [Member] EURO [Member] EUR (€)	Sep. 28, 2013 NuMit [Member] USD ($) Sheet	Dec. 31, 2012 NuMit [Member] USD ($)	Sep. 28, 2013 Steel Technologies LLC [Member] USD ($)	Sep. 28, 2013 Steel Technologies LLC [Member] Maximum [Member]	Sep. 28, 2013 Steel Technologies LLC [Member] Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment	$ 913,700,000		$ 855,900,000		$ 132,900,000	$ 95,400,000	$ 454,600,000			$ 454,600,000			$ 454,100,000				$ 308,400,000	$ 288,400,000
Period used for lag basis, in months				1 month						1 month							1 month
Equity method investment, ownership percentage				50.00%			50.00%			50.00%							50.00%		100.00%
Equity method investments, share of net assets							50,700,000			50,700,000
Step-up to fair value of certain assets and liabilities							403,900,000			403,900,000
Step-up to fair value of equity method investment, portion related to identification of goodwill							326,200,000
Amortization expense and other purchase accounting adjustments due to fair value step-up	56,051,000	53,518,000					2,800,000	2,700,000		8,500,000	8,300,000
Due from related parties, noncurrent							47,300,000			47,300,000		35,000,000		35,000,000
Notes receivable, related parties, interest rate										1.69%									1.17%
Interest rate per year in excess of Euribor as of date of the notes	1.00%
Equity method investment's credit facilities with parent company, maturity date										Jan. 31, 2016							Oct. 21, 2014
Equity method investment's credit facilities, amount							164,800,000			164,800,000					122,500,000
Total amount outstanding under equity method investment's credit facilities							143,200,000			143,200,000			134,800,000		106,000,000	102,000,000
Line of credit facility, maturity period										Apr. 26, 2016									Apr. 01, 2014
Guarantor obligation percentage of exposure in case of default							50.00%			50.00%
Number of sheet processing facilities operated by Steel Technologies																	24
Investment in joint venture																	221,300,000
Notes receivable, related parties																			40,000,000
Basis points in excess of LIBOR on note receivable from related party																			0.90%
Line of credit extended to joint venture, amount outstanding																			16,500,000
Line of credit extended to joint venture																			100,000,000
Line of credit facility extended to joint venture, interest rate																				1.21%	1.20%
Impairment charge against investment in Duferdofin Nucor									$ 30,000,000

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 28, 2013

Schedule of Financial Assets and Financial Liabilities Measured at Fair Value

The following table summarizes information regarding Nucor’s financial assets and financial liabilities that were measured at fair value as of September 28, 2013 and December 31, 2012 (in thousands). Nucor does not currently have any non-financial assets or liabilities that are measured at fair value on a recurring basis.

				Fair Value Measurements at Reporting Date Using
Description	Carrying Amount in Condensed Consolidated Balance Sheets			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
As of September 28, 2013
Assets:
Cash equivalents	$	1,590,572		$	1,590,572	$	—		$	—
Short-term investments		48,476			48,476		—			—
Restricted cash		393			393		—			—
Total assets	$	1,639,441		$	1,639,441	$	—		$	—
Liabilities:
Foreign exchange and commodity contracts	$	(487	)	$	—	$	(487	)	$	—
As of December 31, 2012
Assets:
Cash equivalents	$	830,011		$	830,011	$	—		$	—
Short-term investments		104,167			104,167		—			—
Restricted cash and investments		275,163			275,163		—			—
Total assets	$	1,209,341		$	1,209,341	$	—		$	—
Liabilities:
Foreign exchange and commodity contracts	$	(318	)	$	—	$	(318	)	$	—

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Accumulated Other Comprehensive (Loss) Income (Tables)

9 Months Ended

Sep. 28, 2013

Components of Accumulated Other Comprehensive (Loss) Income

The following tables reflect the changes in accumulated other comprehensive (loss) income by component (in thousands):

	Three Month (13 week) Period Ended September 28, 2013
	Gains and Losses on Hedging Derivatives		Foreign Currency Gain (Loss)			Adjustment to Early Retiree Medical Plan		Total
June 29, 2013	$	—	$	(19,914	)	$	10,580	$	(9,334	)
Other comprehensive (loss) income before reclassifications		—		31,879			—		31,879
Amounts reclassified from accumulated other comprehensive (loss) income into earnings		—		—			—		—
Net current-period other comprehensive (loss) income		—		31,879			—		31,879
September 28, 2013	$	—	$	11,965		$	10,580	$	22,545
	Nine Month (39 week) Period Ended September 28, 2013
	Gains and Losses on Hedging Derivatives		Foreign Currency Gain (Loss)			Adjustment to Early Retiree Medical Plan		Total
December 31, 2012	$	—	$	46,181		$	10,580	$	56,761
Other comprehensive (loss) income before reclassifications		—		(34,216	)		—		(34,216	)
Amounts reclassified from accumulated other comprehensive (loss) income into earnings		—		—			—		—
Net current-period other comprehensive (loss) income		—		(34,216	)		—		(34,216	)
September 28, 2013	$	—	$	11,965		$	10,580	$	22,545

	Three Month (13 week) Period Ended September 29, 2012
	Gains and Losses on Hedging Derivatives			Foreign Currency Gain (Loss)			Adjustment to Early Retiree Medical Plan		Total
June 30, 2012	$	(21,107	)	$	(13,628	)	$	14,384	$	(20,351	)
Other comprehensive (loss) income before reclassifications		—			61,111			—		61,111
Amounts reclassified from accumulated other comprehensive (loss) income into earnings (1)		10,554			—			—		10,554
Net current-period other comprehensive (loss) income		10,554			61,111			—		71,665
Other					(1	)				(1	)
September 29, 2012	$	(10,553	)	$	47,482		$	14,384	$	51,313

1 - Includes $10,554 net-of-tax impact of accumulated other comprehensive income reclassifications into Cost of Products Sold for net losses on commodity contracts. The tax impact of this reclassification was $6,200.

	Nine Month (39 week) Period Ended September 29, 2012
	Gains and Losses on Hedging Derivatives			Foreign Currency Gain (Loss)			Adjustment to Early Retiree Medical Plan		Total
December 31, 2011	$	(40,250	)	$	(12,311	)	$	14,384	$	(38,177	)
Other comprehensive (loss) income before reclassifications		(2,264	)		59,730			—		57,466
Amounts reclassified from accumulated other comprehensive (loss) income into earnings (1)		31,961			—			—		31,961
Net current-period other comprehensive (loss) income		29,697			59,730			—		89,427
Other		—			63			—		63
September 29, 2012	$	(10,553	)	$	47,482		$	14,384	$	51,313

1 - Includes $31,961 net-of-tax impact of accumulated other comprehensive income reclassifications into Cost of Products Sold for net losses on commodity contracts. The tax impact of this reclassification was $18,800.

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Restricted Cash and Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Dec. 31, 2012	Nov. 30, 2010 30-Year Variable Rate Gulf Opportunity Zone Bonds [Member]
Restricted Cash and Investments [Line Items]
Debt instrument face amount				$ 600.0
Term of variable rate bonds, years				30 years
Qualified expenditure for construction of facility	274.9	172.6
Restricted Investments	$ 0		$ 149.8

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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Dec. 31, 2012
Income Tax Disclosure [Line Items]
Effective income tax rate	28.20%	32.30%
Current deferred tax assets	$ 181.4		$ 190.4
Current deferred tax liabilities	13.6		0
Non-current deferred tax liabilities	$ 556.8		$ 566.1

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Stock-Based Compensation - Schedule of Stock Option Plans Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year, Shares	1,543
Granted, Shares	546
Exercised, Shares
Canceled, Shares
Outstanding at end of period, Shares	2,089
Options exercisable at end of period, Shares	242
Outstanding at beginning of year, Weighted - Average Exercise Price	$ 39.03
Granted, Weighted - Average Exercise Price	$ 44.51
Exercised, Weighted - Average Exercise Price
Canceled, Weighted - Average Exercise Price
Outstanding at end of period, Weighted - Average Exercise Price	$ 40.47
Options exercisable at end of period, Weighted - Average Exercise Price	$ 41.43
Outstanding at end of period, Weighted - Average Remaining Contractual Life	8 years 4 months 24 days
Options exercisable at end of period, Weighted - Average Remaining Contractual Life	6 years 8 months 12 days
Outstanding at beginning of year, Aggregate Intrinsic Value
Exercised, Aggregate Intrinsic Value
Outstanding at end of period, Aggregate Intrinsic Value	17,409
Options exercisable at September 28, 2013	$ 1,783

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Fair Value Measurements - Schedule of Financial Assets and Financial Liabilities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	$ 1,590,572	$ 830,011
Short-term investments	48,476	104,167
Restricted cash and investments	393	275,163
Total assets	1,639,441	1,209,341
Foreign exchange and commodity contracts	(487)	(318)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents	1,590,572	830,011
Short-term investments	48,476	104,167
Restricted cash and investments	393	275,163
Total assets	1,639,441	1,209,341
Foreign exchange and commodity contracts
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents
Short-term investments
Restricted cash and investments
Total assets
Foreign exchange and commodity contracts	(487)	(318)
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents
Short-term investments
Restricted cash and investments
Total assets
Foreign exchange and commodity contracts

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Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Net earnings	$ 178,115	$ 129,892	$ 395,113	$ 432,871
Other comprehensive income (loss):
Net unrealized loss on hedging derivatives, net of income taxes of $0 and $0 for the third quarter of 2013 and 2012, respectively, and $0 and $1,100 for the first nine months of 2013 and 2012, respectively				(2,264)
Reclassification adjustment for loss on settlement of hedging derivatives included in net income, net of income taxes of $0 and $6,200 for the third quarter of 2013 and 2012, respectively, and $0 and $18,800 for the first nine months of 2013 and 2012, respectively		10,554		31,961
Foreign currency translation gain (loss), net of income taxes of $500 and $0 for the third quarter of 2013 and 2012, respectively, and $300 and $0 for the first nine months of 2013 and 2012, respectively	31,879	61,111	(34,216)	59,730
Other comprehensive income (loss)	31,879	71,665	(34,216)	89,427
Comprehensive income	209,994	201,557	360,897	522,298
Comprehensive income attributable to noncontrolling interests	(30,518)	(19,585)	(77,582)	(65,097)
Comprehensive income attributable to Nucor stockholders	$ 179,476	$ 181,972	$ 283,315	$ 457,201

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Derivatives

9 Months Ended

Sep. 28, 2013

Derivatives

8. DERIVATIVES: Nucor periodically uses derivative financial instruments primarily to partially manage its exposure to price risk related to natural gas purchases used in the production process as well as to scrap, copper and aluminum purchased for resale to its customers. In addition, Nucor periodically uses derivatives to partially manage its exposure to changes in interest rates on outstanding debt instruments and uses forward foreign exchange contracts to hedge cash flows associated with certain assets and liabilities, firm commitments and anticipated transactions.

Nucor recognizes all derivative instruments in the condensed consolidated balance sheets at fair value. Any resulting changes in fair value are recorded as adjustments to other comprehensive income (loss), net of tax, or recognized in net earnings, as appropriate.

The following tables summarize information regarding Nucor’s derivative instruments (in thousands):

Fair Value of Derivative Instruments

		Fair Value at
	Balance Sheet Location	Sept. 28, 2013			Dec. 31, 2012
Liability derivatives not designated as hedging instruments:
Commodity contracts	Accrued expenses and other current liabilities	$	(453	)	$	(303	)
Foreign exchange contracts	Accrued expenses and other current liabilities		(34	)		(15	)
Total liability derivatives		$	(487	)	$	(318	)

The Effect of Derivative Instruments on the Condensed Consolidated Statements of Earnings

Derivatives Designated as Hedging Instruments

			Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)				Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)					Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion)
Derivatives in Cash Flow Hedging Relationships
	Statement of  Earnings Location		Three Months (13 weeks) Ended				Three Months (13 weeks) Ended					Three Months (13 weeks) Ended
			Sept. 28, 2013		Sept. 29, 2012		Sept. 28, 2013		Sept. 29, 2012			Sept. 28, 2013		Sept. 29, 2012
Commodity contracts		Cost of products sold	$	—	$	—	$	—	$	(10,554	)	$	—	$	—

			Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)					Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)					Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion)
Derivatives in Cash Flow Hedging Relationships
	Statement of  Earnings Location		Nine Months (39 weeks) Ended					Nine Months (39 weeks) Ended					Nine Months (39 weeks) Ended
			Sept. 28, 2013		Sept. 29, 2012			Sept. 28, 2013		Sept. 29, 2012			Sept. 28, 2013		Sept. 29, 2012
Commodity contracts		Cost of products sold	$	—	$	(2,264	)	$	—	$	(31,961	)	$	—	$	500

Derivatives Not Designated as Hedging Instruments

			Amount of Gain or (Loss) Recognized in Earnings on  Derivatives
			Three Months (13 weeks) Ended						Nine Months (39 weeks) Ended
Derivatives Not Designated as Hedging Instruments	Statement of Earnings Location		Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013		Sept. 29, 2012
Commodity contracts		Cost of products sold	$	(789	)	$	(1,454	)	$	4,193	$	(231	)
Foreign exchange contracts		Cost of products sold		134			(25	)		253		146
Total			$	(655	)	$	(1,479	)	$	4,446	$	(85	)

During the first quarter of 2012, Nucor settled all of its open natural gas forward purchase contracts that were previously in place. These settlements affected earnings over the periods specified in the original agreements throughout the remainder of 2012.

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Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 1,722,909	$ 1,052,862
Short-term investments	48,476	104,167
Accounts receivable, net	1,918,165	1,707,317
Inventories, net	2,439,847	2,323,641
Other current assets	339,480	473,377
Total current assets	6,468,877	5,661,364
Property, plant and equipment, net	4,697,339	4,283,056
Restricted cash and investments	393	275,163
Goodwill	1,983,617	2,004,538
Other intangible assets, net	896,407	959,240
Other assets	1,045,143	968,698
Total assets	15,091,776	14,152,059
Current liabilities:
Short-term debt	38,203	29,912
Long-term debt due within one year		250,000
Accounts payable	1,137,352	1,046,713
Salaries, wages and related accruals	288,730	279,898
Accrued expenses and other current liabilities	529,204	423,045
Total current liabilities	1,993,489	2,029,568
Long-term debt due after one year	4,380,200	3,380,200
Deferred credits and other liabilities	854,814	856,917
Total liabilities	7,228,503	6,266,685
Nucor stockholders' equity:
Common stock	150,968	150,805
Additional paid-in capital	1,841,499	1,811,459
Retained earnings	7,088,630	7,124,523
Accumulated other comprehensive income, net of income taxes	22,545	56,761
Treasury stock	(1,498,436)	(1,501,977)
Total Nucor stockholders' equity	7,605,206	7,641,571
Noncontrolling interests	258,067	243,803
Total equity	7,863,273	7,885,374
Total liabilities and equity	$ 15,091,776	$ 14,152,059

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Accumulated Other Comprehensive (Loss) Income - Components of Accumulated Other Comprehensive (Loss) Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance		$ (21,107)		$ (40,250)
Other comprehensive (loss) income before reclassifications, Gain and Losses on Hedging Derivatives				(2,264)
Amounts reclassified from accumulated other comprehensive (loss) income into earnings, Gain and Losses on Hedging Derivatives		10,554		31,961
Net current-period other comprehensive (loss) income, Gain and Losses on Hedging Derivatives		10,554		29,697
Ending Balance		(10,553)		(10,553)
Other
Beginning Balance	(19,914)	(13,628)	46,181	(12,311)
Other comprehensive (loss) income before reclassifications, Foreign Currency Translation	31,879	61,111	(34,216)	59,730
Amounts reclassified from accumulated other comprehensive (loss) income into earnings, Foreign Currency Translation
Net current-period other comprehensive (loss) income, Foreign Currency Translation	31,879	61,111	(34,216)	59,730
Ending Balance	11,965	47,482	11,965	47,482
Other		(1)		63
Beginning Balance	10,580	14,384	10,580	14,384
Other comprehensive (loss) income before reclassifications, Adjustment to Early Retiree Medical Plan
Amounts reclassified from accumulated other comprehensive (loss) income into earnings, Adjustment to Early Retiree Medical Plan
Net current-period other comprehensive (loss) income, Adjustment to Early Retiree Medical Plan
Ending Balance	10,580	14,384	10,580	14,384
Other
Beginning Balance	(9,334)	(20,351)	56,761	(38,177)
Other comprehensive (loss) income before reclassifications	31,879	61,111	(34,216)	57,466
Other comprehensive income (loss)	31,879	71,665	(34,216)	89,427
Ending Balance	22,545	51,313	22,545	51,313
Other		$ (1)		$ 63

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Condensed Consolidated Statements of Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Net sales	$ 4,940,936	$ 4,801,206	$ 14,157,296	$ 14,977,999
Costs, expenses and other:
Cost of products sold	4,532,393	4,452,473	13,132,412	13,848,809
Marketing, administrative and other expenses	125,126	114,392	364,501	334,039
Equity in (earnings) losses of unconsolidated affiliates	(2,252)	2,261	(2,665)	9,093
Impairment of non-current assets				30,000
Interest expense, net	37,467	40,305	109,186	123,028
Costs, expenses and other, total	4,692,734	4,609,431	13,603,434	14,344,969
Earnings before income taxes and noncontrolling interests	248,202	191,775	553,862	633,030
Provision for income taxes	70,087	61,883	158,749	200,159
Net earnings	178,115	129,892	395,113	432,871
Earnings attributable to noncontrolling interests	30,518	19,584	77,582	65,160
Net earnings attributable to Nucor stockholders	$ 147,597	$ 110,308	$ 317,531	$ 367,711
Net earnings per share:
Basic	$ 0.46	$ 0.35	$ 0.99	$ 1.15
Diluted	$ 0.46	$ 0.35	$ 0.99	$ 1.15
Average shares outstanding:
Basic	319,341	318,463	318,979	318,042
Diluted	319,526	318,520	319,132	318,113
Dividends declared per share	$ 0.3675	$ 0.3650	$ 1.1025	$ 1.0950

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Stock-Based Compensation - Summary of Nucor's Restricted Stock Unit Activity (Detail) (RSU [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 28, 2013
RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested at beginning of year, Shares	1,106
Granted, Shares	789
Vested, Shares	(753)
Canceled, Shares	(11)
Unvested at end of period, Shares	1,131
Shares reserved for future grants	10,499
Unvested at beginning of year, Grant Date Fair Value	$ 40.80
Granted, Grant Date Fair Value	$ 44.51
Vested, Grant Date Fair Value	$ 42.17
Canceled, Grant Date Fair Value	$ 39.08
Unvested at end of period, Grant Date Fair Value	$ 42.49

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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 28, 2013

Summary of Stock Option Plans Activity

A summary of activity under Nucor’s stock option plans for the first nine months of 2013 is as follows (in thousands, except year and per share amounts):

	Shares		Weighted - Average Exercise Price		Weighted - Average Remaining Contractual Life		Aggregate Intrinsic Value
Number of shares under option:
Outstanding at beginning of year		1,543	$	39.03
Granted		546	$	44.51
Exercised		—		—
Canceled		—		—
Outstanding at September 28, 2013		2,089	$	40.47		8.4 years	$	17,409
Options exercisable at September 28, 2013		242	$	41.43		6.7 years	$	1,783

Summary of Nucor's Restricted Stock Unit Activity

A summary of Nucor’s RSU activity for the first nine months of 2013 is as follows (shares in thousands):

	Shares			Grant Date Fair Value
Restricted stock units:
Unvested at beginning of year		1,106		$	40.80
Granted		789		$	44.51
Vested		(753	)	$	42.17
Canceled		(11	)	$	39.08
Unvested at September 28, 2013		1,131		$	42.49
Shares reserved for future grants (stock options and RSUs)		10,499

Summary of Nucor's Restricted Stock Awards and Units Under AIP and LTIP

A summary of Nucor’s restricted stock activity under the AIP and LTIP for the first nine months of 2013 is as follows (shares in thousands):

	Shares			Grant Date Fair Value
Restricted stock awards and units:
Unvested at beginning of year		72		$	43.72
Granted		122		$	47.36
Vested		(121	)	$	46.32
Canceled		—			—
Unvested at September 28, 2013		73		$	45.49
Shares reserved for future grants		1,238

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Accumulated Other Comprehensive (Loss) Income

9 Months Ended

Sep. 28, 2013

Accumulated Other Comprehensive (Loss) Income

17. ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME: The following tables reflect the changes in accumulated other comprehensive (loss) income by component (in thousands):

	Three Month (13 week) Period Ended September 28, 2013
	Gains and Losses on Hedging Derivatives		Foreign Currency Gain (Loss)			Adjustment to Early Retiree Medical Plan		Total
June 29, 2013	$	—	$	(19,914	)	$	10,580	$	(9,334	)
Other comprehensive (loss) income before reclassifications		—		31,879			—		31,879
Amounts reclassified from accumulated other comprehensive (loss) income into earnings		—		—			—		—
Net current-period other comprehensive (loss) income		—		31,879			—		31,879
September 28, 2013	$	—	$	11,965		$	10,580	$	22,545
	Nine Month (39 week) Period Ended September 28, 2013
	Gains and Losses on Hedging Derivatives		Foreign Currency Gain (Loss)			Adjustment to Early Retiree Medical Plan		Total
December 31, 2012	$	—	$	46,181		$	10,580	$	56,761
Other comprehensive (loss) income before reclassifications		—		(34,216	)		—		(34,216	)
Amounts reclassified from accumulated other comprehensive (loss) income into earnings		—		—			—		—
Net current-period other comprehensive (loss) income		—		(34,216	)		—		(34,216	)
September 28, 2013	$	—	$	11,965		$	10,580	$	22,545

	Three Month (13 week) Period Ended September 29, 2012
	Gains and Losses on Hedging Derivatives			Foreign Currency Gain (Loss)			Adjustment to Early Retiree Medical Plan		Total
June 30, 2012	$	(21,107	)	$	(13,628	)	$	14,384	$	(20,351	)
Other comprehensive (loss) income before reclassifications		—			61,111			—		61,111
Amounts reclassified from accumulated other comprehensive (loss) income into earnings (1)		10,554			—			—		10,554
Net current-period other comprehensive (loss) income		10,554			61,111			—		71,665
Other					(1	)				(1	)
September 29, 2012	$	(10,553	)	$	47,482		$	14,384	$	51,313

1 - Includes $10,554 net-of-tax impact of accumulated other comprehensive income reclassifications into Cost of Products Sold for net losses on commodity contracts. The tax impact of this reclassification was $6,200.

	Nine Month (39 week) Period Ended September 29, 2012
	Gains and Losses on Hedging Derivatives			Foreign Currency Gain (Loss)			Adjustment to Early Retiree Medical Plan		Total
December 31, 2011	$	(40,250	)	$	(12,311	)	$	14,384	$	(38,177	)
Other comprehensive (loss) income before reclassifications		(2,264	)		59,730			—		57,466
Amounts reclassified from accumulated other comprehensive (loss) income into earnings (1)		31,961			—			—		31,961
Net current-period other comprehensive (loss) income		29,697			59,730			—		89,427
Other		—			63			—		63
September 29, 2012	$	(10,553	)	$	47,482		$	14,384	$	51,313

1 - Includes $31,961 net-of-tax impact of accumulated other comprehensive income reclassifications into Cost of Products Sold for net losses on commodity contracts. The tax impact of this reclassification was $18,800.

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Derivatives - Effect of Derivative Instruments on Condensed Consolidated Statements of Earnings (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives	$ (655)	$ (1,479)	$ 4,446	$ (85)
Cost of Products Sold [Member] | Commodity Contract [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion)				(2,264)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Earnings (Effective Portion)		(10,554)		(31,961)
Amount of Gain or (Loss) Recognized in Earnings on Derivatives (Ineffective Portion)				500
Cost of Products Sold [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives	(789)	(1,454)	4,193	(231)
Cost of Products Sold [Member] | Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Amount of Gain or (Loss) Recognized in Earnings on Derivatives	$ 134	$ (25)	$ 253	$ 146

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Interest Expense (Income) - Schedule of Components of Net Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Interest Expense [Line Items]
Interest expense	$ 38,621	$ 42,954	$ 112,978	$ 132,254
Interest income	(1,154)	(2,649)	(3,792)	(9,226)
Interest expense, net	$ 37,467	$ 40,305	$ 109,186	$ 123,028

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Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible asset amortization expense	$ 18.5	$ 20.4	$ 56.1	$ 53.5
Future amortization expense, in 2013	73.9		73.9
Future amortization expense, in 2014	70.0		70.0
Future amortization expense, in 2015	68.2		68.2
Future amortization expense, in 2016	66.5		66.5
Future amortization expense, in 2017	$ 64.8		$ 64.8
Minimum [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life			3 years
Maximum [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life			22 years

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Inventories - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012
Components Of Inventory [Line Items]
Raw materials and supplies in inventory, percentage	40.00%	37.00%
Finished and semi-finished products in inventory, percentage	60.00%	63.00%
Inventories valued using the last-in, first-out	44.00%	45.00%
Increased value of inventory if FIFO method had been used	$ 607.2	$ 607.2
Lower of cost or market adjustments	$ 2.7	$ 3.5

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Property, Plant and Equipment - Additional information (Detail) (USD $)	9 Months Ended
	Sep. 28, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Accumulated depreciation	$ 6,520,000,000	$ 6,160,000,000
Written down value of property, plant & equipment	21,000,000
Written down value of inventory	7,000,000
Insurance receivable	14,000,000
Associated net charges including marketing, administrative and other expenses	$ 14,000,000

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Current Liabilities

9 Months Ended

Sep. 28, 2013

Current Liabilities

7.

CURRENT LIABILITIES: Book overdrafts, included in accounts payable in the condensed consolidated balance sheets, were $103.2 million at September 28, 2013 ($53.8 million at December 31, 2012). Dividends payable, included in accrued expenses and other current liabilities in the condensed consolidated balance sheets, were $117.8 million at September 28, 2013 ($117.6 million at December 31, 2012).

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Earnings Per Share - Anti-Dilutive Stock Options (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Earnings Per Share [Line Items]
Weighted average shares		801	183	534
Weighted average exercise price		$ 42.07	$ 44.51	$ 42.07

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Interest Expense (Income) (Tables)

9 Months Ended

Sep. 28, 2013

Schedule of Components of Interest Expense

14. INTEREST EXPENSE (INCOME): The components of net interest expense are as follows (in thousands):

	Three Months (13 Weeks) Ended						Nine Months (39 Weeks) Ended
	Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013			Sept. 29, 2012
Interest expense	$	38,621		$	42,954		$	112,978		$	132,254
Interest income		(1,154	)		(2,649	)		(3,792	)		(9,226	)
Interest expense, net	$	37,467		$	40,305		$	109,186		$	123,028

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Current Liabilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012
Accounts Payable And Accrued Liabilities Current [Line Items]
Book overdrafts	$ 103.2	$ 53.8
Dividends Payable, current	$ 117.8	$ 117.6

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Contingencies

9 Months Ended

Sep. 28, 2013

Contingencies

10. CONTINGENCIES: Nucor is subject to environmental laws and regulations established by federal, state and local authorities and, accordingly, makes provision for the estimated costs of compliance. Of the undiscounted total of $23.7 million of accrued environmental costs at September 28, 2013 ($26.5 million at December 31, 2012), $7.7 million was classified in accrued expenses and other current liabilities ($9.5 million at December 31, 2012) and $16.0 million was classified in deferred credits and other liabilities ($17.0 million at December 31, 2012). Inherent uncertainties exist in these estimates primarily due to unknown conditions, evolving remediation technology, and changing governmental regulations and legal standards.

Nucor has been named, along with other major steel producers, as a co-defendant in several related antitrust class-action complaints filed by Standard Iron Works and other steel purchasers in the United States District Court for the Northern District of Illinois. The majority of these complaints were filed in September and October of 2008, with two additional complaints being filed in July and December of 2010. Two of these complaints have been voluntarily dismissed and are no longer pending. The plaintiffs allege that from April 1, 2005 through December 31, 2007, eight steel manufacturers, including Nucor, engaged in anticompetitive activities with respect to the production and sale of steel. The plaintiffs seek monetary and other relief. Although we believe the plaintiffs’ claims are without merit and will vigorously defend against them, we cannot at this time predict the outcome of this litigation or estimate the range of Nucor’s potential exposure.

We are from time to time a party to various lawsuits, claims, and other legal proceedings that arise in the ordinary course of business. With respect to all such lawsuits, claims and proceedings, we record reserves when it is probable a liability has been incurred and the amount of loss can be reasonably estimated. We do not believe that any of these proceedings, individually or in the aggregate, would be expected to have a material adverse effect on our results of operations, financial position or cash flows. Nucor maintains liability insurance for certain risks that is subject to certain self-insurance limits.

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Equity Investments

9 Months Ended

Sep. 28, 2013

Equity Investments

6. EQUITY INVESTMENTS: The carrying value of our equity investments in domestic and foreign companies was $913.7 million at September 28, 2013 ($855.9 million at December 31, 2012) and is recorded in other assets in the condensed consolidated balance sheets.

DUFERDOFIN NUCOR

Nucor owns a 50% economic and voting interest in Duferdofin Nucor S.r.l. (Duferdofin Nucor), an Italian steel manufacturer, and accounts for the investment (on a one-month lag basis) under the equity method, as control and risk of loss are shared equally between the members.

Nucor’s investment in Duferdofin Nucor at September 28, 2013 was $454.6 million ($454.1 million at December 31, 2012). Nucor’s 50% share of the total net assets of Duferdofin Nucor was $50.7 million at September 28, 2013, resulting in a basis difference of $403.9 million due to the step-up to fair value of certain assets and liabilities attributable to Duferdofin Nucor as well as the identification of goodwill ($326.2 million) and finite-lived intangible assets. This basis difference, excluding the portion attributable to goodwill, is being amortized based on the remaining estimated useful lives of the various underlying net assets, as appropriate. Amortization expense and other purchase accounting adjustments associated with the fair value step-up were $2.8 million and $2.7 million in the third quarter of 2013 and 2012, respectively, and were $8.5 million and $8.3 million in the first nine months of 2013 and 2012, respectively.

As of September 28, 2013, Nucor had outstanding notes receivable of €35.0 million ($47.3 million) from Duferdofin Nucor (€35.0 million at December 31, 2012). The notes receivable bear interest at 1.69% and reset annually on September 30 to the twelve-month Euro Interbank Offered Rate (Euribor) plus 1% per year. The principal amounts are due on January 31, 2016. Accordingly, the notes receivable were classified in other assets on the condensed consolidated balance sheets as of September 28, 2013.

Nucor has issued a guarantee for its ownership percentage (50%) of Duferdofin Nucor’s borrowings under Facility A of a Structured Trade Finance Facilities Agreement that matures on April 26, 2016. In the second quarter of 2013, Duferdofin Nucor amended the loan agreement, increasing the maximum amount that it can borrow under Facility A to €122.5 million (or $164.8 million as of September 28, 2013). As of September 28, 2013, it had €106.0 million ($143.2 million) outstanding under that facility (€102.0 million, or $134.8 million, at December 31, 2012). If Duferdofin Nucor fails to pay when due any amounts for which it is obligated under Facility A, Nucor could be required to pay 50% of such amounts pursuant to and in accordance with the terms of its guarantee. Any indebtedness of Duferdofin Nucor to Nucor is effectively subordinated to the indebtedness of Duferdofin Nucor under the Structured Trade Finance Facilities Agreement. Nucor has not recorded any liability associated with the guarantee.

NUMIT

Nucor has a 50% economic and voting interest in NuMit LLC (NuMit). NuMit owns 100% of the equity interest in Steel Technologies LLC, an operator of 24 sheet processing facilities located throughout the U.S., Canada and Mexico. Nucor accounts for the investment in NuMit (on a one-month lag basis) under the equity method as control and risk of loss are shared equally between the members.

Nucor’s investment in NuMit at September 28, 2013 was $308.4 million ($288.4 million as of December 31, 2012). The value of the investment is comprised of the purchase price of approximately $221.3 million plus subsequent additional capital contributions and equity method earnings less distributions since acquisition. Nucor also has recorded a $40.0 million note receivable from Steel Technologies LLC that bears interest at 1.17% as of September 28, 2013 and resets quarterly to the three-month London Interbank Offered Rate (LIBOR) plus 90 basis points. The principal amount is due on October 21, 2014. In addition, Nucor has extended a $100.0 million line of credit (of which $16.5 million was outstanding at September 28, 2013) to Steel Technologies LLC. As of September 28, 2013, the amounts outstanding on the line of credit bear interest at 1.20% to 1.21% and mature on April 1, 2014. The note receivable was classified in other assets and the amount outstanding on the line of credit was classified in other current assets in the condensed consolidated balance sheets.

HUNTER RIDGE

In November 2012, Nucor acquired a 50% economic and voting interest in Hunter Ridge Energy Services LLC (Hunter Ridge). Hunter Ridge provides services for the gathering, separation and compression of energy products including natural gas produced by Nucor’s working interest drilling program. Nucor accounts for the investment (on a one-month lag basis) under the equity method, as control and risk of loss are shared equally between the members. Nucor’s investment in Hunter Ridge at September 28, 2013 was $132.9 million ($95.4 million at December 31, 2012). The acquisition did not result in a significant amount of goodwill or intangible assets.

ALL EQUITY INVESTMENTS

Nucor reviews its equity investments for impairment if and when circumstances indicate that a decline in value below their carrying amounts may have occurred. In the second quarter of 2012, Nucor concluded that a triggering event occurred, requiring assessment for impairment of the equity investment in Duferdofin Nucor due to the continued declines in the global demand for steel, the escalated economic and political turmoil in Europe and continued operating performance well below budgeted levels through the first half of 2012. Duferdofin Nucor had a recently updated unfavorable forecast of future operating performance that was also a contributing factor. The diminished demand combined with the continued lower than budgeted levels of operating performance significantly impacted the financial results of Duferdofin Nucor through the first half of 2012. After completing its assessment, Nucor determined that the carrying amount exceeded its estimated fair value and recorded a $30.0 million impairment charge against the Company’s investment in Duferdofin Nucor.

In the fourth quarter of 2012, Nucor assessed its equity investment in Duferdofin Nucor for impairment. After completing its assessment, the Company determined that the estimated fair value exceeded its carrying amount and that there was no need for additional impairment charges. There has been no significant deterioration in near-term financial projections or any other key assumptions since the most recent impairment analysis was performed. The assumptions that most significantly affect the fair value determination include projected revenues and the discount rate. Steel market conditions in Europe have continued to be challenging through the third quarter of 2013, and, therefore, it is reasonably possible that material deviation of future performance from the estimates used in our most recent valuation could result in further impairment of our investment in Duferdofin Nucor.

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Basis of Interim Presentation

9 Months Ended

Sep. 28, 2013

Basis of Interim Presentation

1. BASIS OF INTERIM PRESENTATION: The information furnished in Item 1 reflects all adjustments which are, in the opinion of management, necessary to a fair statement of the results for the interim periods and are of a normal and recurring nature unless otherwise noted. The information furnished has not been audited; however, the December 31, 2012 condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America. The unaudited condensed consolidated financial statements in this Item 1 should be read in conjunction with the consolidated financial statements and the notes thereto included in Nucor’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012.

Recently Adopted Accounting Pronouncements — In the first quarter of 2013, Nucor adopted new accounting guidance requiring additional disclosures on reclassifications from accumulated other comprehensive income into net income. The new accounting guidance requires entities to report either parenthetically on the face of the financial statements or in the notes to the financial statements these reclassifications for each financial statement line item. Nucor elected to report this information within the notes to the financial statements. This new guidance only impacts disclosures and has no impact on Nucor’s consolidated financial position, results of operations or cash flows.

In the first quarter of 2014, Nucor will adopt new accounting guidance which requires unrecognized tax benefits to be presented as a decrease in net operating loss, similar tax loss or tax credit carryforward if certain criteria are met. The new guidance may affect balance sheet classification of certain unrecognized tax benefits and will have no impact on Nucor’s consolidated results of operations or cash flows.

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Stock-Based Compensation - Summary of Nucor's Restricted Stock Awards and Units Under AIP And LTIP (Detail) (AIP and LTIP [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 28, 2013
AIP and LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested at beginning of year, Shares	72
Granted, Shares	122
Vested, Shares	(121)
Canceled, Shares
Unvested at end of period, Shares	73
Shares reserved for future grants	1,238
Unvested at beginning of year, Grant Date Fair Value	$ 43.72
Granted, Grant Date Fair Value	$ 47.36
Vested, Grant Date Fair Value	$ 46.32
Canceled, Grant Date Fair Value
Unvested at end of period, Grant Date Fair Value	$ 45.49

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Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 28, 2013 Complaints Manufacturers_Distributors	Dec. 31, 2012
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies, gross	$ 23.7	$ 26.5
Accrued environmental loss contingencies, current	7.7	9.5
Accrued environmental loss contingencies, noncurrent	$ 16.0	$ 17.0
Steel manufacturers, number of manufacturers	8
Additional complaints being filed in July and December of 2010	2
Complaints that are dismissed	2

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Segments (Tables)

9 Months Ended

Sep. 28, 2013

Segments

Nucor’s results by segment were as follows (in thousands):

	Three Months (13 Weeks) Ended						Nine Months (39 Weeks) Ended
	Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013			Sept. 29, 2012
Net sales to external customers:
Steel mills	$	3,435,884		$	3,319,518		$	9,901,471		$	10,682,810
Steel products		964,153			1,006,366			2,690,604			2,840,055
Raw materials		540,899			475,322			1,565,221			1,455,134
	$	4,940,936		$	4,801,206		$	14,157,296		$	14,977,999
Intercompany sales:
Steel mills	$	652,077		$	670,876		$	1,924,222		$	1,997,879
Steel products		24,909			17,179			75,036			52,958
Raw materials		2,391,502			2,080,150			6,738,485			7,441,529
Corporate/eliminations		(3,068,488	)		(2,768,205	)		(8,737,743	)		(9,492,366	)
	$	—		$	—		$	—		$	—
Earnings (loss) before income taxes and noncontrolling interests:
Steel mills	$	310,591		$	218,367		$	819,951		$	944,598
Steel products		31,018			(10,252	)		51,167			(34,094	)
Raw materials		(493	)		14,535			13,261			44,223
Corporate/eliminations		(92,914	)		(30,875	)		(330,517	)		(321,697	)
	$	248,202		$	191,775		$	553,862		$	633,030
	Sept. 28, 2013			Dec. 31, 2012
Segment assets:
Steel mills	$	8,137,612		$	7,894,974
Steel products		2,986,752			2,935,146
Raw materials		3,746,813			3,400,690
Corporate/eliminations		220,599			(78,751	)
	$	15,091,776		$	14,152,059

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Accumulated Other Comprehensive (Loss) Income - Components of Accumulated Other Comprehensive (Loss) Income (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Amounts reclassified from accumulated other comprehensive income into earnings		$ 10,554		$ 31,961
AOCI reclassification impact on tax	0	6,200	0	18,800
Cost of Products Sold [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Amounts reclassified from accumulated other comprehensive income into earnings		$ 10,554		$ 31,961

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Employee Benefit Plan

9 Months Ended

Sep. 28, 2013

Employee Benefit Plan

13.

EMPLOYEE BENEFIT PLAN: Nucor makes contributions to a Profit Sharing and Retirement Savings Plan for qualified employees based on the profitability of the Company. Nucor’s expense for these benefits was $22.5 million and $17.5 million in the third quarter of 2013 and 2012, respectively, and was $49.2 million and $58.1 million in the first nine months of 2013 and 2012, respectively. The related liability for these benefits is included in salaries, wages and related accruals.

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Fair Value Measurements

9 Months Ended

Sep. 28, 2013

Fair Value Measurements

9. FAIR VALUE MEASUREMENTS: The following table summarizes information regarding Nucor’s financial assets and financial liabilities that were measured at fair value as of September 28, 2013 and December 31, 2012 (in thousands). Nucor does not currently have any non-financial assets or liabilities that are measured at fair value on a recurring basis.

				Fair Value Measurements at Reporting Date Using
Description	Carrying Amount in Condensed Consolidated Balance Sheets			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
As of September 28, 2013
Assets:
Cash equivalents	$	1,590,572		$	1,590,572	$	—		$	—
Short-term investments		48,476			48,476		—			—
Restricted cash		393			393		—			—
Total assets	$	1,639,441		$	1,639,441	$	—		$	—
Liabilities:
Foreign exchange and commodity contracts	$	(487	)	$	—	$	(487	)	$	—
As of December 31, 2012
Assets:
Cash equivalents	$	830,011		$	830,011	$	—		$	—
Short-term investments		104,167			104,167		—			—
Restricted cash and investments		275,163			275,163		—			—
Total assets	$	1,209,341		$	1,209,341	$	—		$	—
Liabilities:
Foreign exchange and commodity contracts	$	(318	)	$	—	$	(318	)	$	—

Fair value measurements for Nucor’s cash equivalents, short-term investments and restricted cash and investments are classified under Level 1 because such measurements are based on quoted market prices in active markets for identical assets. Our short-term investments are held in similar short-term investment instruments as described in Note 4 to Nucor’s annual report for the year ended December 31, 2012. Fair value measurements for Nucor’s derivatives are classified under Level 2 because such measurements are based on published market prices for similar assets or are estimated based on observable inputs such as interest rates, yield curves, credit risks, spot and future commodity prices, and spot and future exchange rates.

The fair value of short-term and long-term debt, including current maturities, was approximately $4.62 billion at September 28, 2013 ($4.24 billion at December 31, 2012). The debt fair value estimates are classified under Level 2 because such estimates are based on readily available market prices of our debt at September 28, 2013 and December 31, 2012, or similar debt with the same maturities, rating and interest rates.

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Stockholders' Equity

9 Months Ended

Sep. 28, 2013

Stockholders' Equity

16. STOCKHOLDERS’ EQUITY: The following tables reflect the changes in stockholders’ equity attributable to both Nucor and the noncontrolling interests of Nucor’s joint ventures, primarily Nucor-Yamato Steel Company, of which Nucor owns 51% (in thousands):

	Attributable to Nucor Corporation			Attributable to Noncontrolling Interests			Total
Stockholders’ equity at December 31, 2012	$	7,641,571		$	243,803		$	7,885,374
Total comprehensive income		283,315			77,582			360,897
Stock options		8,575			—			8,575
Issuance of stock under award plans, net of forfeitures		24,568			—			24,568
Amortization of unearned compensation		601			—			601
Dividends declared		(353,424	)		—			(353,424	)
Distributions to noncontrolling interests		—			(63,318	)		(63,318	)
Stockholders’ equity at September 28, 2013	$	7,605,206		$	258,067		$	7,863,273
	Attributable to Nucor Corporation			Attributable to Noncontrolling Interests			Total
Stockholders’ equity at December 31, 2011	$	7,474,885		$	231,695		$	7,706,580
Total comprehensive income		457,201			65,097			522,298
Stock options		20,052			—			20,052
Issuance of stock under award plans, net of forfeitures		31,292			—			31,292
Amortization of unearned compensation		600			—			600
Dividends declared		(350,041	)		—			(350,041	)
Distributions to noncontrolling interests		—			(66,562	)		(66,562	)
Other		(645	)					(645	)
Stockholders’ equity at September 29, 2012	$	7,633,344		$	230,230		$	7,863,574

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Interest Expense (Income)

9 Months Ended

Sep. 28, 2013

Interest Expense (Income)

14. INTEREST EXPENSE (INCOME): The components of net interest expense are as follows (in thousands):

	Three Months (13 Weeks) Ended						Nine Months (39 Weeks) Ended
	Sept. 28, 2013			Sept. 29, 2012			Sept. 28, 2013			Sept. 29, 2012
Interest expense	$	38,621		$	42,954		$	112,978		$	132,254
Interest income		(1,154	)		(2,649	)		(3,792	)		(9,226	)
Interest expense, net	$	37,467		$	40,305		$	109,186		$	123,028

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Document and Entity Information	9 Months Ended
	Sep. 28, 2013
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 28, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Entity Registrant Name	NUCOR CORP
Entity Central Index Key	0000073309
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	318,211,045

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Income Taxes

9 Months Ended

Sep. 28, 2013

Income Taxes

15. INCOME TAXES: The effective tax rate for the third quarter of 2013 was 28.2% compared to 32.3% for the third quarter of 2012. The decrease in the effective tax rate for the third quarter of 2013 as compared to the third quarter of 2012 is primarily due to the change in relative proportions of net earnings attributable to noncontrolling interests to total pre-tax earnings between the periods and the impact of the reversal of tax reserves due to closing of the statute of limitations in the third quarter of 2013. Nucor has concluded U.S. federal income tax matters for years through 2009. The 2010 to 2012 tax years are open to examination by the Internal Revenue Service. The tax years 2010 through 2012 remain open to examination by other major taxing jurisdictions to which Nucor is subject (primarily Canada and other state and local jurisdictions).

Current deferred tax assets included in other current assets were $181.4 million at September 28, 2013 ($190.4 million at December 31, 2012). Current deferred tax liabilities included in accrued expenses and other current liabilities were $13.6 million at September 28, 2013 (none at December 31, 2012). Non-current deferred tax liabilities included in deferred credits and other liabilities were $556.8 million at September 28, 2013 ($566.1 million at December 31, 2012).

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Earnings Per Share - Computations of Basic and Diluted Net Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Earnings Per Share [Line Items]
Basic net earnings	$ 147,597	$ 110,308	$ 317,531	$ 367,711
Earnings allocated to participating securities	(518)	(412)	(1,324)	(1,242)
Net earnings available to common stockholders	147,079	109,896	316,207	366,469
Average shares outstanding	319,341	318,463	318,979	318,042
Basic net earnings per share	$ 0.46	$ 0.35	$ 0.99	$ 1.15
Diluted net earnings	147,597	110,308	317,531	367,711
Earnings allocated to participating securities	(518)	(412)	(1,324)	(1,242)
Net earnings available to common stockholders	$ 147,079	$ 109,896	$ 316,207	$ 366,469
Basic shares outstanding	319,341	318,463	318,979	318,042
Dilutive effect of stock options and other	185	57	153	71
Diluted average shares outstanding	319,526	318,520	319,132	318,113
Diluted net earnings per share	$ 0.46	$ 0.35	$ 0.99	$ 1.15

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Segments - Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Net sales to external customers	$ 4,940,936	$ 4,801,206	$ 14,157,296	$ 14,977,999
Intercompany sales
Earnings before income taxes and noncontrolling interests	248,202	191,775	553,862	633,030
Segment assets	15,091,776		15,091,776		14,152,059
Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales to external customers	3,435,884	3,319,518	9,901,471	10,682,810
Intercompany sales	652,077	670,876	1,924,222	1,997,879
Earnings before income taxes and noncontrolling interests	310,591	218,367	819,951	944,598
Segment assets	8,137,612		8,137,612		7,894,974
Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales to external customers	964,153	1,006,366	2,690,604	2,840,055
Intercompany sales	24,909	17,179	75,036	52,958
Earnings before income taxes and noncontrolling interests	31,018	(10,252)	51,167	(34,094)
Segment assets	2,986,752		2,986,752		2,935,146
Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales to external customers	540,899	475,322	1,565,221	1,455,134
Intercompany sales	2,391,502	2,080,150	6,738,485	7,441,529
Earnings before income taxes and noncontrolling interests	(493)	14,535	13,261	44,223
Segment assets	3,746,813		3,746,813		3,400,690
Corporate/Eliminations [Member]
Segment Reporting Information [Line Items]
Intercompany sales	(3,068,488)	(2,768,205)	(8,737,743)	(9,492,366)
Earnings before income taxes and noncontrolling interests	(92,914)	(30,875)	(330,517)	(321,697)
Segment assets	$ 220,599		$ 220,599		$ (78,751)